57 entries under rugged topic. ×

1
heavy(adjective, strong, hard, tough, severe)
1
immovable(adjective, strong, hard, tough, sturdy)
1
mortified(adjective, strong, hard, tough, severe)
1
mulish(adjective, strong, hard, tough, severe)
1
serious(adjective, close, strong, hard, tough)
1
stiff-necked(adjective, strong, hard, tough, severe)
0
dense(adjective, strong, hard, tough, sturdy)
0
ferric(adjective, strong, hard, tough, sturdy)
0
ferrous(adjective, strong, hard, tough, sturdy)
0
indomitable(adjective, strong, hard, tough, sturdy)
0
insensible(adjective, strong, hard, tough, sturdy)
0
robust(adjective, strong, hard, tough, sturdy)
0
steel(adjective, strong, hard, tough, sturdy)
0
strong(adjective, hard, tough, severe, sharp)
0
sturdy(adjective, strong, hard, tough)
0
thick(adjective, strong, hard, tough, sturdy)
0
tough inflexible(expression, strong, hard, tough, sturdy)
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APASmart Define. (2016). unsparing thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unsparing/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsparing thesaurus" https://smartdefine.org/unsparing/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, unsparing thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unsparing/thesaurus/synonyms>.
MLASmart Define. "unsparing thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/unsparing/thesaurus/synonyms>