Synonyms|677Antonyms|192|Broader|9Narrower|10Related|1.3k

322 entries under adjective topic. ×

1
high-principled(honest, pure, sure, constant)
1
immortal
1
immovable(firm, determined, usual, regular)
1
immutable(hard, severe, rough, harsh)
1
in the bag(expression, idiom, solid, certain)
1
inalterable(certain, limited, definite, inflexible)
1
incessant(steady, regular, persistent, even)
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indissoluble
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indomitable(persistent, obstinate, insistent, dogged)
1
indubitable(solid, certain, real, sure)
1
inexorable(persistent, obstinate, insistent, dogged)
1
inflexible(hard, rough, harsh, certain)
1
insubordinate(persistent, obstinate, insistent, dogged)
1
insured(verb, set, solid, certain)
1
insurgent(persistent, obstinate, insistent, dogged)
1
intent(certain, determined, usual, regular)
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intractable(persistent, obstinate, insistent, dogged)
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invincible(persistent, obstinate, insistent, dogged)
1
iron(persistent, obstinate, insistent, dogged)
1
ironclad(firm, determined, usual, regular)
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ChicagoSmart Define. 2016. "confirmed thesaurus" https://smartdefine.org/confirmed/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, confirmed thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/confirmed/thesaurus/synonyms>.
MLASmart Define. "confirmed thesaurus" 26 February 2016. Web. 26 September 2026. <https://smartdefine.org/confirmed/thesaurus/synonyms>