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use‧less

1 not useful or effective in any way [≠ useful]:
The doctor concluded that further treatment would be useless.
The doctor concluded that further treatment would be useless. virtually/completely/totally etc useless
Water had got into the radio, and now it was completely useless.
Water had got into the radio, and now it was completely useless.2 informal unable or unwilling to do anything properly :
Don't ask Tim to fix it. He's completely useless.
Don't ask Tim to fix it. He's completely useless. —uselessly adverb
—uselessness noun [uncountable]
WORD FOCUS: bad 
very bad: awful, terrible, horrible, lousy informal, appalling, ghastly, atrocious, horrendous
bad, but not very bad: not very good, mediocre, second-rate, so-so, lacklustre
of bad quality: shoddy, inferior, poor quality, cheap, crummy informal
bad at doing something: be no good at something
very bad at doing something: hopeless, terrible, useless, lousy informal, incompetent
morally bad: evil, wicked, immoral, corrupt, sick, perverted, degenerate
➔ See also bad
