the period of time before daybreak

dark; dim / sombre; gloomy

time / hour / the hours or time when something happens

inaudible, quiet, silent / calm, tranquil / still, stopped and not moving / not busy

beautiful

(archaic) beautiful

daybreak / (in compounds) end (of a certain period of time), or immediately following / (in compounds) beginning (of a year, month, day, etc.)

timetable

dark / blackish / foolish / secret; covert / memorize; recite from memory

darkness