FIRM Synonyms: 351 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/firm
WebSee Definitions and Examples. Synonyms for FIRM: company, house, business, interest, enterprise, corporation, concern, agency; Antonyms of FIRM: weak, uncertain, feeble, fragile, frail, limp, listless, spiritless.
DA: 72 PA: 37 MOZ Rank: 77