Antonyms of adj unspent

1 sense of unspent

Sense 1
unspent, unexpended -- ((of financial resources) not spent; "unexpended funds"; "his unspent allowance")

INDIRECT (VIA unexhausted) -> exhausted, spent -- (depleted of energy, force, or strength; "impossible to grow tobacco on the exhausted soil"; "the exhausted food sources"; "exhausted oil wells")

Similarity of adj unspent

1 sense of unspent

Sense 1
unspent, unexpended -- ((of financial resources) not spent; "unexpended funds"; "his unspent allowance")
       => unexhausted (vs. exhausted) -- (not used up completely; "an unexhausted well")