unconvincing

Adjective
  1. Not convincing (synset 300618080)
    "a flimsy argument"; "as unconvincing as a forced smile"
    also: incredible, unbelievable - beyond belief or understanding
    similar to: unpersuasive - not capable of persuading
    same as: flimsy
  2. Having a probability too low to inspire belief (synset 301805119)
    similar to: implausible - having a quality that provokes disbelief
    same as: improbable, unbelievable, unlikely

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