Inhibit and suppress both hold things down, at different depths. To inhibit is to turn the rate down on something already running — the process continues, below its natural level. To suppress is to press the whole thing down so it cannot surface at all: a revolt, a feeling, a report, the immune system. Inhibit caps what is happening; suppress stops it appearing.
Science keeps the distinction sharpest, and it is worth borrowing. Inhibition acts on the activity of something that exists — an enzyme already in the cell is slowed by an inhibitor. Suppression acts on whether the thing shows up at all: a gene is suppressed so less protein is ever made, an immune system is suppressed so it cannot respond. The everyday senses follow the same line. An inhibited speaker is talking, just carefully; a suppressed story never reached print. One is a dial turned down, the other a lid pressed on.
inhibit
To inhibit is to hold back — to keep something from happening fully or freely. A drug can inhibit the growth of bacteria; shyness can inhibit a student from speaking; cold can inhibit a reaction. The word does not mean to stop dead so much as to restrain, dampen, and limit, keeping a process or impulse below the level it would otherwise reach. To be 'inhibited' is to be held in by self-consciousness, unable to let go.
suppress
To suppress is to hold something down by force — sub, 'under', plus premere, 'to press'. Regimes suppress dissent, drugs suppress immune responses, people suppress smiles, memories, and grief. The press in the word never gets to rest, because suppression is not removal: what is held down remains, fully charged, directly under the hand that holds it. That is the word's standing warning — pressure is a debt, and what is suppressed in one place tends to surface in another.
| inhibit | suppress | |
|---|---|---|
| Meaning | hold below the natural level | press down so it cannot surface |
| The thing | keeps running, more slowly | is stopped from appearing |
| Agent | often impersonal — cold, a drug | usually someone, with intent |
| Science | enzyme inhibition — activity down | gene or immune suppression — output down |
| Grammar | also inhibit X from doing Y | transitive only — suppress X |
| Classic objects | growth, a reaction, an impulse | dissent, evidence, a revolt, emotion |
The brake pad and the shouted-down table. Inhibit is the pad: the wheel spins on, just slower, and lift the pad and it recovers instantly — a level held under, nothing hidden. Suppress is the table turning on a raised idea until it goes out: not slowed, prevented from being there at all, and usually by someone who meant it. Ask whether the thing is still happening. Running but reduced: inhibit. Stopped from surfacing: suppress.
inhibit
- iLow temperatures inhibit bacterial growth without killing the culture.
- iiStatins inhibit the enzyme the liver uses to make cholesterol.
- iiiBeing corrected constantly inhibits beginners from speaking.
suppress
- iThe regime suppressed the protest and every report of it.
- iiChemotherapy suppresses the immune system for weeks.
- iiiHe suppressed a laugh and looked at the floor.
Political history belongs to suppress alone: governments suppress dissent, newspapers and rebellions, and no amount of formality will let inhibit take those objects. The grammar reinforces the divide — suppress is transitive only, so it always needs the thing itself as its object, while inhibit can also reach for a person and a from-clause. That is why 'the regime inhibited the protest' reads as a category error rather than merely an odd word choice. How suppress differs from repress and oppress is drawn on the suppress word page.
TOEFL science passages carry both with technical intent, and reading items paraphrase them differently: inhibit becomes 'slow' or 'reduce', suppress becomes 'hold down' or 'keep from appearing'. In writing, the safest guide is the object — inhibit growth, a reaction, an enzyme; suppress dissent, evidence, emotion, the immune system. Political and historical objects never take inhibit, which is the error most likely to be marked.