no good
[adjective]
Synonyms: worthless, draffy, drossy, good-for-nothing, inutile, no-account, nothing, unworthy, valueless
[noun]
Synonyms: wastrel, bad lot, good-for-nothing, ne'er-do-well, profligate, rounder, scapegrace, waster, wretch, blighter, lowlife, mucker, worm, wormling

[TahlilGaran] English Synonym Dictionary ▲

no-good adjective

1. (of a person) bad; not helpful or useful

[TahlilGaran] English Dictionary ▲

no good
not very useful or effective.
It's no good trying to change his beliefs.

This little handgun isn't any good beyond ten yards.

Usage notes: sometimes used in the form not much good:
I'm not much good at explaining math problems.

[TahlilGaran] English Idioms Dictionary ▲

no good
adj. phr. Not satisfactory; not adequate; not approved.
"That's no good," I told him when he began to cry.
He was no good at arithmetic.
He tried appealing to the man's pride, but it did no good.

[TahlilGaran] English Idioms Dictionary ▲