good-for-nothing; loser; waste of space
Strongly derogatory term for a person considered worthless or a failure in life. Often used as an insult or in self-deprecation.
That guy is a good-for-nothing.
You mustn't think of yourself as a loser.
Standard spelling for this derogatory term.
Alternate spelling using 損い; less common than 生まれ損ない.
Compound of 生まれ (umare, 'birth') and 損ない (sokonai, 'failure, damage'), literally 'birth failure'. The exact historical origin is uncertain, but it follows a productive pattern of noun+損ない to indicate a flawed or failed version of something.