役やく立たたず

noun which may take the genitive case particle 'no'

useless; good-for-nothing

Describes a person or thing that is completely unhelpful or fails to serve its purpose. Often used as a derogatory noun for a person.

• 彼かれは何なにもできない役やく立たたずだ。

  He is a useless person who can't do anything.

• この道どう具ぐは壊こわれていて役やく立たたずだ。

  This tool is broken and useless.