18 entries under tough topic. ×

17
formidable(adjective, awful, terrible, fear)
13
dire(adjective, difficult, awful, terrible)
10
fearful(adjective, difficult, awful, terrible)
8
appalling(adjective, difficult, awful, terrible)
8
terrible(adjective, difficult, awful, fear)
7
dreadful(adjective, difficult, awful, terrible)
7
frightful(adjective, difficult, awful, terrible)
7
horrible(adjective, difficult, awful, terrible)
7
horrific(adjective, difficult, awful, terrible)
6
awful(difficult, terrible, fear, dreadful)
6
tremendous(adjective, difficult, awful, terrible)
4
great(adjective, respect, knowledge, difficult)
4
shocking(adjective, difficult, awful, terrible)
3
powerful(adjective, difficult, vigorous, noble)
1
indomitable(difficult, determined, vigorous, noble)
1
puissant(difficult, vigorous, noble, stout)
0
heroic(determined, vigorous, noble, stout)
0
overwhelming(difficult, awful, terrible, strange)
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APASmart Define. (2016). redoubtable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/redoubtable/thesaurus/synonyms
ChicagoSmart Define. 2016. "redoubtable thesaurus" https://smartdefine.org/redoubtable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, redoubtable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/redoubtable/thesaurus/synonyms>.
MLASmart Define. "redoubtable thesaurus" 2 March 2016. Web. 25 September 2026. <https://smartdefine.org/redoubtable/thesaurus/synonyms>