Fainéant (noun) (rare)
An idle or ineffective person.
From the French ‘fais’ does ‘neant’ nothing.
“He looks busy all day but he’s a faineant through and through!”
Something or someone that one vehemently dislikes/ A strong curse.
Early 16th century: from ecclesiastical Latin, ‘excommunicated person, excommunication’, from Greek anathema ‘thing dedicated’, (later) ‘thing devoted to evil, accursed thing’, from anatithenai ‘to set up’.