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undefinable

ADJECTIVE
inexplicable
Synonyms
STRONGEST
baffling incomprehensible mysterious mystifying odd peculiar puzzling strange unaccountable unfathomable
WEAK
enigmatic indecipherable indescribable inexplainable inscrutable insoluble obscure unexplainable unintelligible unsolvable
Antonyms
STRONGEST
comprehensible explainable fathomable intelligible normal regular standard understandable usual
WEAK
comprehendible explicable
ADJECTIVE
unexplainable
Synonyms
WEAK
baffling enigmatic incomprehensible indecipherable indescribable inexplainable inscrutable insoluble mysterious mystifying obscure odd peculiar puzzling strange unaccountable unfathomable unintelligible unsolvable

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.