190 entries under tough topic. ×

3
forbidding(adjective, strong, hard, harsh)
3
hard as nails(expression, adjective, idiom, set, strong)
3
perverse(adjective, severe, difficulty, harsh)
3
stark(adjective, strong, sound, severe)
3
vital(adjective, strong, intense, energetic)
2
adamant(adjective, strong, hard, sturdy)
2
astringent(adjective, strong, hard, severe)
2
authoritarian(adjective, strong, hard, sturdy)
2
bleak(adjective, hard, severe, sharp)
2
boisterous(strong, fit, harsh, coarse)
2
bouncing(adjective, strong, intense, energetic)
2
callous(adjective, set, strong, hard)
2
difficile(adjective, rough, difficult, heavy)
2
flourishing(adjective, strong, solid, intense)
2
forcible(adjective, strong, sound, energetic)
2
frowning(adjective, strong, hard, sturdy)
2
indefatigable(adjective, strong, sound, fit)
2
inflexible(adjective, set, strong, hard)
2
insensible(adjective, strong, hard, sturdy)
2
murder(adjective, severe, rough, difficult)
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APASmart Define. (2015). rugged thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/rugged/thesaurus/synonyms
ChicagoSmart Define. 2015. "rugged thesaurus" https://smartdefine.org/rugged/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, rugged thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/rugged/thesaurus/synonyms>.
MLASmart Define. "rugged thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/rugged/thesaurus/synonyms>