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say it: STED-fast
steadfast is an adjective meaning "marked by firm determination or resolution; not shakable". It carries 2 recorded senses.
marked by firm determination or resolution; not shakable
“firm convictions”
“a firm mouth”
“steadfast resolve”
“a man of unbendable perseverence”
“unwavering loyalty”
firm and dependable especially in loyalty
“a steadfast ally”
“a staunch defender of free speech”
“unswerving devotion”
“unswerving allegiance”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for steadfast come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.