REQUIRED Synonyms: 95 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/required
Web ResultSynonyms for REQUIRED: mandatory, necessary, compulsory, incumbent, needed, urgent, obligatory, imperative; Antonyms of REQUIRED: optional, voluntary, elective, discretionary, unnecessary, chosen, unwanted, unimportant
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