good-for-nothing
no-accountUSold-fashionedinformal
SMART Vocabulary: related words and phrases
Useless and futile
adrift
aimless
aimlessly
aimlessness
airy-fairy
fruitless
fruitlessly
fruitlessness
futile
futilely
negate
negation
non-viable
nugatory
ornamental
unrealistic
unrealistically
unseriousness
until you are blue in the faceidiom
unviability
no good | American Dictionary
no good
idiom(alsonot any/much good)
not very useful or effective:
It's no good trying to change his beliefs.
I'm not much good at explaining math problems.