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She found his glib excuses unconvincing and evasive.
The politician's denials were unconvincing and had no leg to stand on against the mounting evidence.
His excuse for not completing the project on time was unconvincing, and he was asked to redo it.
The actor's attempt at a British accent hit a false note, sounding unnatural and unconvincing.
The company’s marketing campaign was criticized for being cardboard and unconvincing.
