119 entries under severe topic. ×

1
unsparing(adjective, close, strong, hard, tough)
1
vexatious(adjective, hard, rough, difficult)
1
wearisome(adjective, hard, tough, rough)
0
afflictive(adjective, heavy, acute, dangerous)
0
cumbersome(harsh, big, heavy, substantial)
0
ghastly(adjective, bad, offensive, intense)
0
grueling(adjective, difficult, harsh, heavy)
0
hateful(adjective, intense, extreme, grave)
0
horrible(adjective, intense, unpleasant, extreme)
0
horrid(adjective, bad, offensive, intense)
0
obnoxious(adjective, bad, offensive, intense)
0
odious(adjective, bad, offensive, intense)
0
offensive(adjective, bad, intense, unpleasant)
0
repulsive(adjective, bad, offensive, intense)
0
revolting(adjective, bad, offensive, intense)
0
shocking(adjective, intense, unpleasant, terrible)
0
sudden
0
unsympathetic(adjective, harsh, strict, unyielding)
0
very important
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APASmart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>