106 entries under tough topic. ×

2
hard-core(adjective, strong, hard, firm)
2
hard-line(adjective, strong, hard, rough)
2
heartless(adjective, mean, hard, harsh)
2
indomitable(adjective, strong, hard, determined)
2
insubordinate(adjective, firm, unreasonable, grim)
2
rebellious(adjective, firm, unreasonable, grim)
2
rough(adjective, person, strong, hard)
2
rugged(adjective, strong, hard, sturdy)
2
sturdy(adjective, strong, hard, firm)
2
uncooperative(adjective, mean, hard, persistent)
2
unmanageable(adjective, firm, unreasonable, grim)
2
unsparing(adjective, strong, hard, sturdy)
1
authoritarian(adjective, strong, hard, sturdy)
1
balky(adjective, firm, unreasonable, grim)
1
bullhead(adjective, mean, hard, harsh)
1
cussed(firm, unreasonable, grim, inflexible)
1
dense(adjective, strong, hard, sturdy)
1
dyed-in-the-wool(adjective, set, strong, hard)
1
fast(adjective, strong, secure, firm)
1
forbidding(adjective, person, strong, hard)
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APASmart Define. (2016). adamant thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/adamant/thesaurus/synonyms
ChicagoSmart Define. 2016. "adamant thesaurus" https://smartdefine.org/adamant/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, adamant thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/adamant/thesaurus/synonyms>.
MLASmart Define. "adamant thesaurus" 23 March 2016. Web. 30 September 2026. <https://smartdefine.org/adamant/thesaurus/synonyms>