dark night; moonless night
Refers to a night with no moonlight or very little light, often evoking a sense of deep darkness.
The cawing of a crow echoed through the dark night.
It's hard to see your feet on a moonless night.
月夜 is a night lit by the moon, while 闇夜 is a dark, moonless night.
aimless attempt; shot in the dark
Standard kanji spelling.
Mixed kanji-kana spelling; less common but still used.
Compound of 闇 (yami, 'darkness') and 夜 (yo, 'night'). The reading やみよ is a straightforward combination of the kun'yomi readings.