29 entries under serious topic. ×

10
severe(adjective, strong, hard, tough, severe)
6
austere(adjective, strong, hard, tough, severe)
6
tough(noun, adjective, strong, hard, severe)
4
astringent(adjective, strong, hard, tough, severe)
4
grim(adjective, strong, hard, tough, severe)
3
unsparing(adjective, strong, hard, tough, severe)
2
relentless(adjective, strong, hard, tough, severe)
2
stiff-necked(adjective, strong, hard, tough, severe)
2
stubborn(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)
1
hang-tough(adjective, strong, hard, tough, severe)
1
hard-boiled(adjective, strong, hard, tough, severe)
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APASmart Define. (2015). authoritarian thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/authoritarian/thesaurus/synonyms
ChicagoSmart Define. 2015. "authoritarian thesaurus" https://smartdefine.org/authoritarian/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, authoritarian thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/authoritarian/thesaurus/synonyms>.
MLASmart Define. "authoritarian thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/authoritarian/thesaurus/synonyms>