Refers to an error or failed attempt, often implying a slip or botched job. Similar to 仕損じ (しそんじ), but 仕損ない is slightly more colloquial.
See also: 仕損じ (しそんじ)
I made a blunder during the important presentation.
This document is full of mistakes.
Standard kanji spelling.
Mixed kana-kanji spelling; also common.
Compound of 仕 (し, continuative form of する 'to do') + 損ない (そこない, noun form of 損なう 'to fail, to spoil'). Literally 'doing-failure'.