Which alternative to improve fits depends on what was wrong before. Nothing was wrong: enhance, refine, polish. Something was broken: fix, remedy, rectify. Something was slow or wasteful: streamline, optimize, boost. Something recovered on its own: pick up, rally. Each word makes a quiet claim about the starting point.
29 synonyms for “improve,” sorted by what changed
Making something better in quality
- enhance
- refine
- upgrade
- better
- polish
- perfect
- elevate
Fixing what was wrong
- fix
- remedy
- correct
- rectify
- repair
- ameliorate
Raising performance
- boost
- strengthen
- raise
- optimize
- streamline
- sharpen
Getting better without intervention
- recover
- progress
- advance
- pick up
- rally
- look up
Developing a skill
- develop
- hone
- build on
- cultivate
Which synonym should you use?
| If you mean… | Best alternatives |
|---|---|
| Adding to something already good | enhance, elevate |
| Removing small imperfections | refine, polish |
| Replacing with a better version | upgrade |
| Putting right something faulty | fix, correct, rectify |
| Easing a bad situation | ameliorate, alleviate |
| Cutting out waste or steps | streamline |
| Getting more out of what exists | optimize |
| A quick, often temporary lift | boost |
| Recovering after a decline | rally, pick up, recover |
| Getting better at something | hone, develop, cultivate |
Improve synonyms explained
1. Enhance
Adding to something that was already working. The word assumes a decent starting point, which is why enhance the flavor is natural and enhance the broken hinge is not.
Best used when: nothing was wrong and something got better. It is heavily used in marketing, so it can sound like a claim with no content behind it.
The second window enhances the light in the back room considerably.
2. Refine
Improving by taking away — imprecision, roughness, excess. It implies several small passes rather than one change, and it suits processes, arguments and techniques.
Best used when: the work is subtraction and repetition. It has a literal industrial sense too, as in refining oil or sugar.
We refined the intake form over about six versions.
3. Polish
Final, small improvements to something essentially finished. Polishing a draft means fixing sentences, not restructuring it, so the word signals that the hard work is done.
Best used when: only the surface remains. Saying a proposal just needs polishing is a claim about how much time it will take, and one people often get wrong.
The layout is settled — it just needs polishing before Friday.
4. Upgrade
Replacing something with a better version rather than improving the thing itself. That is a real distinction: an upgraded server is a different server, while an optimized one is the same machine working harder.
Best used when: a substitution happened. It also works for tiers and plans, where nothing physical changes at all.
They upgraded the whole fleet to the diesel model in 2019.
5. Rectify
Formally putting right something that was wrong, with the fault acknowledged. It is the language of complaints, audits and apologies, and it implies a duty to fix rather than a choice.
Best used when: responsibility is part of the message. Correct is the neutral everyday version and carries no such weight.
The billing error was rectified in the following statement.
6. Ameliorate
Making a bad situation less bad without solving it. That limit is the whole point — you ameliorate hardship, shortages and effects, and the problem is still there afterward.
Best used when: the honest claim is partial. It is formal enough to draw attention, and alleviate or ease will usually read better.
The grants ameliorated the worst of the shortfall but nothing more.
7. Boost
A push upward, usually quick and often temporary. It suits numbers, morale and signals, and the temporary implication is why a boost in sales reads differently from growth in sales.
Best used when: the lift came from a specific push. If the improvement is expected to hold, raise or increase is more honest.
The listing gave bookings a boost for about three weeks.
8. Optimize
Getting the best possible result within fixed constraints. Strictly there is one optimum, so optimize further is a contradiction — though almost nobody uses the word that carefully.
Best used when: you can name what is being maximized and what is fixed. Without both, it is filler.
The route was optimized for fuel use, not for driver hours.
9. Streamline
Improving by removing steps, friction or people. The last of those is why the word is often a euphemism in corporate announcements — streamlining a department usually means it got smaller.
Best used when: something was genuinely taken out. If nothing was removed, the word is wrong.
Streamlining the approval chain cut two days off every order.
10. Hone
Sharpening a skill through repeated practice. It takes skills and instincts as objects, never objects or systems — you hone a technique, not a spreadsheet.
Best used when: a person got better at something over time. It is the word behind the common error hone in, which should be home in.
She honed the presentation across a dozen site visits.
11. Rally
Recovering after a clear decline. The word needs a fall behind it, which is why markets, teams and patients rally and a steadily rising figure does not.
Best used when: there was a low point. Pick up is the informal version and needs only a flat period, not a drop.
Attendance rallied in the spring after a poor winter.
12. Cultivate
Deliberately growing something over time — a skill, a habit, a relationship, a reputation. The gardening image is still working, so it implies patience and conditions rather than effort alone.
Best used when: the improvement took sustained, low-intensity attention.
He cultivated contacts at every depot on the line.
“Improve” or “improve on”?
These mean different things, and the preposition carries the whole difference.
- Improve the design — you made this design better.
- Improve on the design — you produced something better than it. The original is untouched.
- Nobody has improved on it since — a standard way of saying something remains the best version.
Improve upon is the same construction in a more formal register. Both are correct; on is more common in American English.
Grammar and word forms
- Transitive and intransitive. We improved the process and the weather improved are both correct. The intransitive use is what makes improve so useful when nobody wants to say who did it.
- Improvement is both countable and uncountable. An improvement, three improvements — but room for improvement takes no article and no plural.
- Perfect as a verb stresses the second syllable — per-FECT — and differs from the adjective PER-fect.
- Better as a verb survives mainly in better yourself and better the record. Elsewhere it reads as dated.
Common questions
What is a professional word for “improve”?
Enhance if nothing was wrong, streamline if you removed steps, optimize if you can name the constraint, rectify if there was a fault. On a CV the specific verb is worth more than any of them, because it tells the reader what the starting problem was.
What is the difference between “improve” and “enhance”?
Improve works whether or not something was wrong. Enhance assumes it was already fine and something was added. Saying you enhanced a failing process is a quiet contradiction that readers notice.
Is “optimize” overused?
Badly, and it has drifted from meaning anything precise. The test is whether you can finish the sentence optimized for ___, given fixed ___. If you cannot, improve is more honest and shorter.