fealltach

fear fealltach a dhéanfadh a leithéid de dhroich-bheart ar a chara. = It is a treacherous man who would do such a bad turn on his friend. Is olc é an cara fealltach. = A treacherous friend is bad. Thá sé fealltach ná cuir do mhuinghin ann. = He is treacherous dont depend on him.