expression, i-adjective
completely useless; of no use whatsoever; good for nothing
Emphatic negative of 役に立つ; stresses total lack of utility or value. Often used in frustration or dismissal.
See also: 役に立たない (やくにたたない)
この古いパソコンはもう役にも立たない。
This old computer is completely useless now.
彼の言い訳は役にも立たなかった。
His excuse was of no use whatsoever.