improbable
[adjective]
Synonyms: doubtful, dubious, fanciful, far-fetched, implausible, questionable, unconvincing, unlikely, weak

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Antonyms: probable

[TahlilGaran] English Synonym Dictionary ▲

im‧prob‧a‧ble /ɪmˈprɒbəbəl $ -ˈprɑː-/ adjective
[Word Family: noun: probability, probable; adverb: probably ≠ improbably; adjective: probable ≠ improbable]

1. not likely to happen or to be true Synonym : unlikely Antonym : probable:
a film with an improbable plot
It seems highly improbable that he had no knowledge of the affair.

2. surprising and slightly strange Synonym : unlikely:
improbable combinations of colours
—improbably adverb
—improbability /ɪmˌprɒbəˈbɪləti, ɪmˌprɒbəˈbɪlɪti $ -ˌprɑː-/ noun [uncountable and countable]

[TahlilGaran] Dictionary of Contemporary English ▲

improbable
adj.
VERBS appear, be, look, seem, sound | become | make sth These new facts make the theory improbable.
ADV. extremely, highly, very, wildly a wildly improbable idea
completely, quite | not altogether | fairly, rather, slightly | inherently, intrinsically There is nothing inherently improbable in the idea.

[TahlilGaran] Collocations Dictionary ▲