心こころ当あたりのない

expression, i-adjective

completely unknown; having no clue about; unexpected

Used when one has absolutely no idea or recollection about something; often in negative contexts like 心当たりのない請求 (a bill one has no memory of).

See also: 心当たりがない

• そんなメールは心こころ当あたりのないものだった。

  That email was something I had no clue about.

• 心こころ当あたりのない請せい求きゅう書しょが届とどいた。

  I received a bill that I have no memory of.