I think the adjective form is convaincant, i.e. not identical to the present participle convainquant. [1]
- J'espère avoir été convaincante en vous convainquant. - I hope I was convicing while convicing you. - Fiskjuice 09:22, 7 May 2010 (UTC)
- That would fit with (deprecated template usage) fatiguant/(deprecated template usage) fatigant. Mglovesfun (talk) 09:34, 7 May 2010 (UTC)