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WORDNET DICTIONARY
OXFORD DICTIONARY
THESAURUS

WORDNET DICTIONARY

Adjective unconvincing has 2 senses

• unconvincing(a = adj.all) flimsy - not convincing; "unconvincing argument"; "as unconvincing as a forced smile"
Antonym: convincing

• unconvincing(s = adj.all) improbable, unbelievable, unlikely - having a probability too low to inspire belief; Array

OXFORD DICTIONARY

THESAURUS

unconvincing

a bit thick, a bit thin, absurd, beyond belief, doubtable, doubtful, dubious, dubitable, flimsy, hard of belief, hard to believe, implausible, improbable, inconceivable, incredible, not deserving belief, open to doubt, open to suspicion, passing belief, preposterous, problematic, questionable, ridiculous, staggering belief, suspect, suspicious, tall, thick, thin, unbelievable, unearthly, ungodly, unimaginable, unsubstantial, unthinkable, unworthy of belief, weak

For further exploring for "unconvincing" in Webster Dictionary Online