convincingгерундий или причастие настоящего времени Convincing is a present participle functioning adjectivally; marking it explicitly clarifies morphology.
The lawyer presented a convincing argument in court.
Адвокат представил убедительный аргумент в суде.
convinceгерундий или причастие настоящего времени Used attributively or predicatively to describe something that is persuasive, e.g. "a convincing argument".