steadfast - definition and synonyms

adjective 

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/ˈstedˌfɑːst/
  1. not changing your opinions or actions, because you have a strong belief in someone or something
    be/remain steadfast (in something):

    They remained steadfast in their refusal to release the terrorists.

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derived words

steadfastly

adverb
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steadfastness

noun [uncountable]
 Synonyms and related words