15 entries under difficult topic. ×

3
strict(adjective, hard, severe, rough, firm)
2
rigid(adjective, hard, tough, severe, rough)
1
austere(adjective, hard, tough, severe, rough)
1
demanding(adjective, hard, severe, rough)
1
exacting(adjective, hard, tough, severe, rough)
1
hard(adjective, tough, severe, rough, firm)
1
oppressive(adjective, hard, tough, severe, rough)
1
punctilious(adjective, hard, tough, severe, rough)
1
rigorous(adjective, hard, tough, severe, rough)
1
rough(adjective, hard, severe, harsh)
1
scrupulous(adjective, hard, tough, severe, rough)
1
stern(adjective, hard, tough, severe, rough)
1
stringent(adjective, hard, tough, severe, rough)
0
arduous(adjective, hard, severe, rough)
0
laborious(adjective, hard, severe, rough)
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APASmart Define. (2013). unpermissive thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unpermissive/thesaurus/synonyms
ChicagoSmart Define. 2013. "unpermissive thesaurus" https://smartdefine.org/unpermissive/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2013, unpermissive thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unpermissive/thesaurus/synonyms>.
MLASmart Define. "unpermissive thesaurus" 28 June 2013. Web. 23 September 2026. <https://smartdefine.org/unpermissive/thesaurus/synonyms>