171 entries under tough topic. ×

3
toilsome(adjective, hard, severe, rough)
3
tyrannical(adjective, hard, harsh, cruel)
3
uphill(adjective, hard, severe, rough)
2
antagonistic(adjective, severe, harsh, grim)
2
cold(adjective, severe, harsh, cruel)
2
difficile(adjective, rough, difficult, heavy)
2
grinding(adjective, severe, rough, difficult)
2
hairy(adjective, severe, rough, difficult)
2
hard-core(adjective, strong, hard, severe)
2
hard-nosed(adjective, strong, hard, severe)
2
hard-shell(adjective, strong, hard, severe)
2
hostile(adjective, severe, harsh, grim)
2
inhuman(adjective, hard, harsh, cruel)
2
intolerable(adjective, severe, harsh, heavy)
2
intolerant(adjective, hard, severe, firm)
2
knotty(adjective, severe, rough, difficult)
2
merciless(adjective, hard, difficult, harsh)
2
operose(adjective, hard, severe, rough)
2
picky(adjective, severe, fine, firm)
2
rancorous(adjective, harsh, grim, painful)
10 years ago|17k views|share |citing 
APASmart Define. (2016). rigorous thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms
ChicagoSmart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, rigorous thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>.
MLASmart Define. "rigorous thesaurus" 26 February 2016. Web. 26 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms>