Synonyms|251Antonyms|39|Broader|2Narrower|0Related|383

38 entries under stiff topic. ×

2
rocklike(adjective, firm, rigid)
2
severe(adjective, strong, hard, tough, harsh)
2
strict(adjective, set, strong, hard, tough)
1
austere(adjective, strong, hard, tough, severe)
1
callous(adjective, set, strong, hard, firm)
1
dyed-in-the-wool(adjective, set, strong, hard, tough)
1
hard-line(adjective, strong, hard, tough, severe)
1
indomitable(adjective, set, strong, hard, tough)
1
single-minded(tough, firm, cruel, strict)
1
stringent(adjective, hard, severe, resolute)
1
thick(adjective, strong, hard, tough, firm)
0
compact(adjective, set, strong, hard, firm)
0
compacted(adjective, set, strong, hard, firm)
0
compressed(adjective, set, strong, hard, firm)
0
concentrated(adjective, set, strong, hard, firm)
0
consolidated(adjective, set, strong, hard, firm)
0
indurated(adjective, set, strong, hard, firm)
0
packed(adjective, set, strong, hard, firm)
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HarvardSmart Define 2015, adamantine thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>.
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