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English definition of “firm”

firm

adjective (CERTAIN)    /fɜːm/ US  /fɝːm/
B2 certain and not likely to change: He is a firm believer in traditional family values. Some people still claim that there is no firm evidence linking smoking with lung cancer.CertaintyConfidence and self-assurance
(Definition of firm adjective (CERTAIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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