Aggravate and lessen move the same trouble in opposite directions. To aggravate is to make a bad condition worse — the level forced up by some careless or deliberate action. To lessen is to make it smaller in amount, degree, or intensity — the level brought down, or coming down on its own. One drives the dial up; the other moves it down.
Both verbs act on degree, and their manners differ as much as their directions. Aggravate, from the Latin aggravare, 'to make heavier', arrives with an actor and usually a reproach: something pressed on the sore spot, and the word remembers who. Lessen, plain English on 'less', is bloodless by comparison — a quantity reduced, by anyone or nothing — which is why it works both ways ('the risk lessened') while aggravate never lets go of its object. A finger pointed up the scale; a mark sliding down it.
aggravate
To aggravate something is to make a bad thing worse — and the word points a finger while it says so. A condition that is aggravated did not simply deteriorate; some outside action worked on it, often a careless or deliberate one: running on a sprained ankle aggravates the injury, a harsh reply aggravates a quarrel. The worsening tends to stick. Its mirror-opposites are alleviate, relieve and ease, and its close cousin is exacerbate, which is more formal and often accidental. In everyday speech aggravate has a second job: to annoy or irritate someone, usually through repetition.
lessen
To lessen something is to make it smaller in amount, degree, or intensity — the plain, neutral 'make less'. You lessen the risk, the impact, the pain, the chance of failure: a measurable quantity simply goes down. It is the most everyday and least dramatic member of its family. Unlike mitigate, which counters or cushions a harmful effect, and unlike ease, which gently soothes something felt, lessen just reduces how much of something there is. It can also be intransitive — over time the pressure lessened on its own.
| aggravate | lessen | |
|---|---|---|
| Meaning | make a bad condition worse | make or become smaller in degree |
| Direction | forces the level up | brings the level down |
| Agency | always an outside hand | optional — can lessen by itself |
| Tone | often reproachful | neutral |
| Grammar | transitive only | transitive or intransitive |
| Example | Noise aggravates his tinnitus. | Earplugs lessen the noise. |
Watch the dial on the same trouble. Bouncing on the bandaged ankle jumps the red pulse up a size with every landing — the level forced up by a hand that should have known better: aggravate. The steady arm around a grieving shoulder thins the grey weight to a smudge — the level coming down: lessen. What one hand aggravates, another lessens; the dial only ever answers to one of them at a time.
aggravate
- iDust aggravates the children's asthma.
- iiThe pay freeze aggravated staff discontent.
- iiiRubbing the eye only aggravates the irritation.
lessen
- iAir filters lessen the dust in the workshop.
- iiA fair bonus lessened the discontent for a while.
- iiiTime lessened the sharpness of the grief.
They meet around conditions with a degree — pain, irritation, tension, discontent — where one verb names what pushes the level up and the other what brings it down. The asymmetries: aggravate carries blame and the informal 'annoy' sense; lessen carries neither, and alone among the two can stand without an object ('the pain lessened').