Noun

• S: (n) firm, house, business firm (the members of a business organization that owns or operates one or more establishments) "he worked for a brokerage house"

Verb

• S: (v) tauten, firm (become taut or tauter) "Your muscles will firm when you exercise regularly"; "the rope tautened"
• S: (v) tauten, firm (make taut or tauter) "tauten a rope"

Adjective

• S: (adj) firm, steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering (marked by firm determination or resolution; not shakable) "firm convictions"; "a firm mouth"; "steadfast resolve"; "a man of unbendable perseverence"; "unwavering loyalty"
• S: (adj) firm, solid (not soft or yielding to pressure) "a firm mattress"; "the snow was firm underfoot"; "solid ground"
• S: (adj) firm, strong (strong and sure) "a firm grasp"; "gave a strong pull on the rope"
• S: (adj) firm (not subject to revision or change) "a firm contract"; "a firm offer"
• S: (adj) firm ((of especially a person's physical features) not shaking or trembling) "his voice was firm and confident"; "a firm step"
• S: (adj) firm, steady, unfluctuating (not liable to fluctuate or especially to fall) "stocks are still firm"
• S: (adj) firm (securely established) "holds a firm position as the country's leading poet"
• S: (adj) firm (possessing the tone and resiliency of healthy tissue) "firm muscles"
• S: (adj) fast, firm, immobile (securely fixed in place) "the post was still firm after being hit by the car"
• S: (adj) firm, loyal, truehearted, fast (unwavering in devotion to friend or vow or cause) "a firm ally"; "loyal supporters"; "the true-hearted soldier...of Tippecanoe"- Campaign song for William Henry Harrison; "fast friends"

Adverb

• S: (adv) firm, firmly, steadfastly, unwaveringly (with resolute determination) "we firmly believed it"; "you must stand firm"