You need to specify Irish Gaelic or Scottish Gaelic: they are two separate languages.
handsome in irish dathúil Pronunciation: dhah-oo-il
dathúil
Rógaire dóighiúil
very handsome
Handsome man in Russian is красивый мужчина (krasivyy muzhchina).
ademi jigit (handsome young man), ademi erkek (handsome man)
ademi jigit (handsome young man), ademi erkek (handsome man)
Es (you are) vir pulcher (a handsome man, literally a man handsome). Es vir pulcher.
Goedemorgen aantrekkelijke man
hombre atractivo
You could say 'muy guapo' (presuming you are talking about a man) or to really emphasis how handsome someone is, you could say 'guapísimo'.