useless Definition

useless
adj

1. Serving no practical purpose.

Thesaurus: worthless, ineffectual, of no use, unserviceable, non-functional, expendable; Antonym: efficient, operative.
2. colloq
Not at all proficient.
Example: I've always been useless at maths
Form: useless at something (often)

Derivative: uselessly
adverb

Derivative: uselessness
noun

Etymology: 16c.