Synonyms|552Antonyms|100|Broader|5Narrower|0Related|576

59 entries under fantastic topic. ×

1
extreme(adjective, strange, stupid, crazy, unreasonable)
1
flamboyant(adjective, strange, ugly, gross)
1
frantic
1
frenetic
1
half-baked(dull, weak, simple, foolish, stupid)
1
harebrained(weak, simple, silly, foolish, stupid)
1
ill-conceived(silly, foolish, unwise, impractical)
1
impracticable(silly, foolish, unwise, impractical)
1
inappropriate(wrong, false, foolish, stupid, awkward)
1
of unsound mind(expression, idiom, silly, foolish)
1
out of all reason(expression, idiom, silly, foolish)
1
quixotic(silly, foolish, unwise, impractical)
1
short-sighted(adjective, weak, simple, silly, foolish)
1
unrealistic(adjective, silly, foolish, unwise)
1
unsafe
1
unsound(adjective, silly, foolish, stupid, crazy)
1
unstable
1
unworkable(silly, foolish, unwise, impractical)
0
non compos mentis(expression, idiom, foolish)
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ChicagoSmart Define. 2015. "ludicrous thesaurus" https://smartdefine.org/ludicrous/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, ludicrous thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/ludicrous/thesaurus/synonyms>.
MLASmart Define. "ludicrous thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/ludicrous/thesaurus/synonyms>