have no idea; have no clue; can't think of anything
Used when you cannot recall or think of any relevant information, person, or possibility. Often appears in negative form 心当たりがない. The related phrase 心当たりのない is an adnominal form.
See also: 心当たりのない
Antonyms: 心当たりがある
I have absolutely no idea who did such a thing.
I have no clue why she is angry.
Adnominal form meaning 'having no clue about', used to modify nouns.
have an idea; have a clue; ring a bell
Standard kanji-kana mixed spelling.
Variant using the kanji 無い for ない; slightly more formal or emphatic.
Compound of 心 (こころ, 'mind') + 当たり (あたり, 'hitting upon') + が + ない ('not'). Literally 'there is no hitting upon in the mind', i.e., nothing comes to mind.