54 entries under problematical topic. ×

2
slavish(adjective, tough, rough, difficult, heavy)
2
terrible(adjective, tough, rough, difficult, intense)
2
toilful(adjective, tough, rough, difficult, heavy)
2
unsparing(adjective, tough, rough, difficult, harsh)
1
difficile(adjective, tough, severe, rough, difficult)
1
distressing(adjective, tough, severe, rough, difficult)
1
irksome(adjective, dull, difficult, awkward, boring)
1
merciless(adjective, tough, severe, rough, difficult)
1
murder(adjective, hard, great, tough, severe)
1
testing(adjective, tough, severe, difficult, violent)
0
awkward(adjective, difficult, demanding, grueling)
0
involved(adjective, tough, rough, difficult, heavy)
0
scabrous(adjective, tough, rough, difficult, heavy)
-1
uphill battle(expression, adjective, tough, rough, difficult)
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APASmart Define. (2016). strenuous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/strenuous/thesaurus/synonyms
ChicagoSmart Define. 2016. "strenuous thesaurus" https://smartdefine.org/strenuous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, strenuous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/strenuous/thesaurus/synonyms>.
MLASmart Define. "strenuous thesaurus" 1 April 2016. Web. 25 September 2026. <https://smartdefine.org/strenuous/thesaurus/synonyms>