423 entries under adjective topic. ×

5
thickened(verb, hard, firm, solid)
5
unbending(hard, firm, solid, careless)
5
uncontrite(hard, tough, harsh, cruel)
5
unforgiving(person, hard, tough, harsh)
4
accustomed(set, hard, usual, regular)
4
calcified(set, firm, solid, petrified)
4
emotionless(cool, blank, aloof, unemotional)
4
experienced(sophisticated, skilled, mature, seasoned)
4
flinty(rocky, pebbly)
4
incorrigible(bad, complete, rude, corrupt)
4
indurate(set, hard, firm, solid)
4
jelled(verb, hard, tough, firm)
4
petrified(verb, set, hard, firm)
4
ruthless(hard, tough, severe, harsh)
4
steely(hard, firm, solid, cold)
4
taut(hard, firm, solid, stiff)
4
unconcerned(hard, cool, careless, indifferent)
4
unrepentant(impenitent, impenitence)
3
acclimatized(strong, fit, healthy, well)
3
aloof(hard, cool, indifferent, blank)
10 years ago|17k views|share |citing 
APASmart Define. (2016). hardened thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/hardened/thesaurus/synonyms
ChicagoSmart Define. 2016. "hardened thesaurus" https://smartdefine.org/hardened/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, hardened thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/hardened/thesaurus/synonyms>.
MLASmart Define. "hardened thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/hardened/thesaurus/synonyms>