108 entries under tough topic. ×

4
forbidding(adjective, strong, hard, severe)
4
hard-line(adjective, strong, hard, severe)
4
rugged(adjective, strong, hard, severe)
3
unkind(adjective, harsh, cruel, grim)
3
adamantine(adjective, set, strong, hard)
3
bleak(adjective, severe, harsh, cruel)
3
cold(adjective, severe, harsh, cruel)
3
hard-nosed(adjective, strong, hard, severe)
3
hard-shell(adjective, strong, hard, severe)
3
hard-shelled(adjective, hard, severe, rough)
3
immovable(adjective, set, strong, hard)
3
indomitable(adjective, strong, hard, resolute)
3
rough(adjective, strong, hard, severe)
3
serious(adjective, strong, hard, severe)
3
stiff-necked(adjective, strong, hard, severe)
2
brutal(adjective, hard, severe, rough)
2
inclement(adjective, hard, severe, rough)
2
by the book(expression, adjective, idiom, strong, hard)
2
callous(adjective, hard, severe, rough)
2
dense(adjective, strong, hard, sturdy)
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APASmart Define. (2015). strict thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/strict/thesaurus/synonyms
ChicagoSmart Define. 2015. "strict thesaurus" https://smartdefine.org/strict/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, strict thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/strict/thesaurus/synonyms>.
MLASmart Define. "strict thesaurus" 3 August 2015. Web. 28 September 2026. <https://smartdefine.org/strict/thesaurus/synonyms>