millteanach, a1. 1. Terrible, horrible. Gníomh ~, terrible deed. Éagóir mhillteanach, horrible injustice. Ba mhillteanach an bás é, it was an awful death. 2. (a) Enormous, extreme. Athrú ~, immense change. Tá deifir mhillteanach air, he is in a terrible hurry. (b) (Intensifying) ~ mór, fada, fuar, terribly big, long, cold.