I. adjective
1.
Synonyms: fast 4, fixed, secure, set, tenacious, tight
2.
Synonyms: stable 4, secure, solid, sound
3.
having a texture or consistency that resists deformation by external force
firm flesh
Synonyms: hard, solid
Related Word: close, compact, dense, thick; inelastic, inflexible, rigid, stiff, unyielding; sturdy, substantial, tough
Contrasted words: flaccid, flimsy, floppy, limp, loose, slack, sleazy, soft, squishy
Antonyms: flabby
4.
that has been established and is not usually subject to change
a firm price
Synonyms: certain, fixed, set, settled, stated, stipulated
Related Word: established, going, prevailing; consistent, stable, steady, unwavering; definite, exact, explicit, specific, undeviating; flat
Contrasted words: changeable, fluctuating, shaky, shifting, unsteady, variable
5.
Synonyms: sure 1, fast, secure, stable, staunch, strong
6.
Synonyms: sure 2, abiding, enduring, fixed, never-failing, steadfast, steady, unfaltering, unqualified, unwavering
II. adverb
Synonyms: hard 7, fast, firmly, fixedly, solidly, steadfastly, tight, tightly
III. noun
Synonyms: enterprise 3, business, company, concern, establishment, house, outfit