pointless, useless; not worth doing, especially because it is not likely to succeed / (colloquial) No point or advantage.

The quality or degree of being useful.

The act of using. / (uncountable) The act of consuming alcohol or narcotics. / (uncountable, followed by "of") Usefulness, benefit. / A function; a purpose for which something may be employed.

(transitive) To employ; to apply; to utilize. / (transitive, often with up) To expend; to consume by employing. / (transitive) To exploit.

simple past tense and past participle of use / (intransitive, auxiliary, defective, only in past tense/participle) To perform habitually; to be accustomed [to doing something].

That is or has or have been used. / That has or have previously been owned by someone else. / Familiar through use; usual; accustomed.

Having a practical or beneficial use.

(temporal location) Formerly and habitually or repeatedly, but possibly no longer, did.

(idiomatic, with noun phrase) Accustomed to, tolerant or accepting of.

(now uncommon outside certain constructions) Infinitive or present tense form of used to: formerly (and habitually or repeatedly) be accustomed to. / (nonstandard) Synonym of used to