1. adjective intelligent, skilful2. adjective excellent3. adjective very bright4. adjective of colour5. interjection very good6. noun diamond1 adjective intelligent, skilfuliontach adj1 c m uar fheabhas c m uthar barr c m uthar cionn c m uthat's a brilliant ideasmaoineamh iontach é sin, sin an-smaoineamh, sin ardsmaoineamha brilliant mathematicianmatamaiticeoir den scoth, matamaiticeoir sáréirimiúil, matamaiticeoir fíor-ábalta2 adjective excellentar fheabhas c m uthar barr c m uthar cionn c m ua brilliant concertsárcheolchoirm fem2, ceolchoirm den scothwe had a brilliant daybhí an-lá againn, bhí lá iontach againn
3 adjective very brightgléigeal adj1 c m ulonrach adj1 c m u4 adjective of colourlonrach adj1 c m uniamhrach adj1 c m u5 interjection informal very goodar fheabhas c m uthar barr c m uthar cionn c m uabsolutely brilliant!ar dóigh ar fad!, go diail ar fad!6 noun diamondniamhchloch fem2 c m u