firmer; firmest
1
: fairly hard or solid : not soft
firm flesh
firm muscles
a firm mattress
a firm stomach
a firm cheese
2
: set, placed, or attached in a way that is not easily moved
a firm base/foundation
—often used figurativelyHe believes that his argument is on firm ground/footing. [=that he has good support, evidence, etc., for his argument]
3
: not weak or uncertain
a firm [=strong] handshake/grip
She has a firm grasp of the basic principles.
They insist on maintaining firm control over the project.
He spoke to her in a soft but firm voice.
The time has come for us to take a firm stand.
The children need gentle but firm handling.
4
a
: not likely to change or be changed
We've made firm [=definite] plans for next weekend.
a firm price/estimate/offer
The dollar remained firm against the euro.
reaching a firm conclusion/decision
They haven't set a firm date for their wedding.
The campaign has taken a firm hold on the public's imagination.
b
: having or showing true and constant support for something or someone
I'm a firm [=strong] believer in the value of exercise. = I have a firm belief in the value of exercise.
Those two are firm friends. [=they are very close friends]
firms; firmed; firming
1
: to put (something, such as a plan) into a final form
—usually + up
We still need to firm up our vacation plans.
2
: to make (something) harder or more solid : to make (something) less loose
I've been doing exercises to firm (up) and strengthen my stomach muscles.
She firmed [=tightened] her grip on the racket.
3
: to make (something) stronger
Her early failures only firmed [=strengthened] her resolve (to succeed).
4
: to become less likely to change or become weaker
The market is firming.
—often + upThe market is firming up.
Imports are rising and prices are firming up.
Cite this Entry
“Firm.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/firm. Accessed 23 Apr. 2026.
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