Synonyms|16Antonyms|0|Broader|0Narrower|0Related|0
1
behooves(must, should, requires, behoves)
1
have to(verb, expression, must, should, requires)
1
is becoming(verb, expression, must, should, requires)
1
is fitting(verb, expression, must, should, requires)
1
is logical(verb, expression, must, should, requires)
1
is necessary(verb, expression, must, should, requires)
1
is reasonable(verb, expression, must, should, requires)
1
is responsible for(verb, expression, idiom, must, should)
1
must(should, behoves)
1
ought to(verb, expression, must, should)
1
requires(must, should, behoves)
0
be duty-bound to(must, should)
0
had better(expression, must, should)
0
have a duty to(expression, idiom, must, should)
0
should(must, behoves)
0
would(must, should)
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APASmart Define. (2011). is natural thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/is_natural/thesaurus/synonyms
ChicagoSmart Define. 2011. "is natural thesaurus" https://smartdefine.org/is_natural/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2011, is natural thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/is_natural/thesaurus/synonyms>.
MLASmart Define. "is natural thesaurus" 23 May 2011. Web. 20 September 2026. <https://smartdefine.org/is_natural/thesaurus/synonyms>