1 noun cul-de-saccaochbhealach masc1 c m u2 noun unsuccessful course of actionhe did a lot of research on it but it ended up being a blind alleyrinne sé a lán taighde air ach saothar in aisce a bhí ann, rinne sé cuid mhór taighde air ach ní raibh dada ar a shon aige