nightest (adjective) nocturnal: happening at night
Detalii: nocturnal means belonging to or active during the night; diurnal means belonging to or active during the day
Sinonime: absolutely, all the way, altogether, competently, comprehensively, conclusively, effectively, en masse, exclusively, exhaustively, extensively, finally, from A to Z, from beginning to end, fully, heart and soul, hook line and sinker, in all, in and out, in entirety, in full, in toto, inside out, on all counts, painstakingly, perfectly, quite, solidly, thoroughly, to the end, to the limit, to the max, to the nth degree, totally, ultimately, unabridged, unanimously, unconditionally, undividedly, up and down, utterly, wholly, without omission