Scuza lui a fost neconvingatoare si nimeni nu l-a crezut.
His excuse was unconvincing and nobody believed him.
Argumentul din prezentare era neconvingator si slab documentat.
The argument in the presentation was unconvincing and poorly documented.
A incercat sa explice, dar a sunat neconvingator.
He tried to explain, but came across as unconvincing.
