Impede and inhibit both slow things without stopping them, but they act on different things. To impede is to obstruct movement along a path — progress, traffic, a rescue, the flow of goods: something in the way taxes every step. To inhibit is to hold a process or impulse below the level it would reach on its own — growth, a reaction, a behaviour. Impede blocks a journey; inhibit caps a rate.
Latin gives the picture in each case. Impede is in- plus pes, 'foot' — literally to shackle the feet, which is why it belongs to anything that travels: progress, access, traffic, an investigation. Inhibit is in- plus habere, 'to hold' — a hand kept on something to stop it rising to full strength, which is why it belongs to processes and impulses: bacterial growth, an enzyme, a shy speaker. Neither is a full stop. What separates them is whether the thing was going somewhere or simply running.
impede
To impede is to slow something that is trying to move. The Latin impedire meant 'to shackle the feet' — im- on, pes foot — and the image still fits: what impedes does not destroy or forbid; it ties weights to every step. Bad weather impedes a rescue, bureaucracy impedes innovation, an injury impedes recovery. The destination usually stays reachable — impeding steals time and effort, not the goal itself, which is what separates it from 'prevent'.
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.
| impede | inhibit | |
|---|---|---|
| Meaning | obstruct the progress of | hold below its natural level |
| Acts on | journeys: progress, access, flow | processes: growth, reactions, impulses |
| The picture | something in the way | a hand held on it |
| Latin | in- + pes, 'foot' — shackle the feet | in- + habere, 'to hold' |
| Grammar | plain object — impede progress | also inhibit X from doing Y |
| Nouns | impediment (the obstacle) | inhibition (the restrained state) |
The snagged lane and the braked wheel. Impede puts something in the runner's path so every stride costs extra — the destination is still reached, just late. Inhibit lays a pad on the rim so the wheel turns at less than it could — no journey, no obstacle, only a capped rate. Ask whether something is travelling or simply running. In the way of a journey: impede. Holding a process under its own speed: inhibit.
impede
- iFallen power lines impeded the rescue for two days.
- iiPoor transport links impede trade between the two regions.
- iiiNothing should be allowed to impede the investigation.
inhibit
- iCold weather inhibits the growth of most seedlings.
- iiThe drug inhibits the enzyme that drives the reaction.
- iiiFear of mistakes inhibits students from speaking at all.
One further asymmetry is worth storing: inhibited works as a personality adjective — an inhibited speaker, too inhibited to ask — describing someone habitually held back by their own restraint. Impeded has no such life; it stays an event that happened to a journey, never a way of being. That is a good sign of how deep each verb sits: inhibit can describe a standing condition of a person, while impede only ever describes a passage made harder. How impede sorts against hamper is drawn on its own page in the 'Related' list below.
Collocation decides the mark. TOEFL and IELTS writing put impede with progress, trade, access and development — things that travel — while inhibit belongs to science and psychology: inhibit growth, inhibit an enzyme, feel inhibited. The band-costing swap runs the other way: 'cold impedes bacterial growth' puts an obstacle in the path of something that has no path, where inhibits is the accurate verb. Reading items paraphrase both as hinder, so precision questions usually turn on which object each verb takes.