na-adjective
detailed; clear; in full detail
Describes something being explained, known, or revealed in thorough detail. Often used in the adverbial form つまびらかに to mean 'in detail' or 'clearly'. The reading つばひらか is obsolete.
事件の経緯をつまびらかに説明した。
I explained the circumstances of the incident in detail.
彼の過去はつまびらかではない。
His past is not clear.