(not) well; (not) properly; (not) enough
Used with a negative verb to mean that something is not done well, properly, or sufficiently. Often interchangeable with ろくに, but ろくろく can sound slightly more emphatic or colloquial.
See also: ろくに
He passed the exam without even studying properly.
I couldn't sleep well.
Ateji (phonetic) kanji form; rarely used.
Ateji (phonetic) kanji form; rarely used.
Rarely used kanji form.
Rarely used kanji form.
The origin is uncertain. The kanji forms are ateji (phonetic) or rarely used spellings, and the word is usually written in kana.