Synonyms|178Antonyms|32|Broader|2Narrower|0Related|7

30 entries under serious topic. ×

6
stern(adjective, hard, tough, severe, rough)
4
tough(adjective, strong, hard, rough, firm)
3
hard-shell(adjective, strong, hard, tough)
3
relentless(adjective, strong, hard, tough, firm)
3
severe(adjective, strong, hard, tough, rough)
2
hard-boiled(adjective, strong, hard, tough, severe)
2
hard-nosed(adjective, strong, hard, tough, severe)
2
stubborn(adjective, strong, hard, tough, rough)
1
astringent(adjective, strong, hard, tough, severe)
1
austere(adjective, strong, hard, tough, severe)
1
authoritarian(adjective, strong, hard, tough, severe)
1
bitter(adjective, strong, hard, tough, severe)
1
bullheaded(adjective, strong, hard, tough, severe)
1
by the book(expression, adjective, idiom, strong, hard)
1
cruel(adjective, strong, hard, tough, severe)
1
disciplinary(adjective, strong, hard, tough, severe)
1
dyed-in-the-wool(adjective, strong, hard, tough, severe)
1
flinty(adjective, strong, hard, tough, severe)
1
forbidding(adjective, strong, hard, tough, severe)
1
frowning(adjective, strong, hard, tough, severe)
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APASmart Define. (2015). hard-line thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/hard-line/thesaurus/synonyms
ChicagoSmart Define. 2015. "hard-line thesaurus" https://smartdefine.org/hard-line/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, hard-line thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/hard-line/thesaurus/synonyms>.
MLASmart Define. "hard-line thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/hard-line/thesaurus/synonyms>