Functional
Functional adjective - Being in effective operation.
Usage example: I don't think that vending machine is functional, so don't put money into it
Useless
Useless adjective - Not capable of being put to use or account.
Usage example: a garage full of useless junk
Functional is an antonym for useless.
Both words in one sentence
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The one time he seems useless is when he builds a fully functional Humongous Mecha of Reptar that can stretch its limbs, has a butt rocket, is surprisingly durable, and can throw a mean punch...and sells it to a stage show in France instead of the military or NASA for millions.
Source: Reed Richards Is Useless - Even one of the powerups can ruin your game by replacing a perfectly functional weapon with a useless one.
Source: Nintendo Hard / Platform Games -
The Dragonriders in the early Dragonriders of Pern novels are widely considered to be a useless political relic that no longer serves any functional purpose.
Source: No Mere Windmill
Cite this Source
Useless and Functional. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/functional/useless
Functional & Useless. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/functional/useless>.
Useless or Functional. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/functional/useless.
Google Ngram Viewer shows how "functional" and "useless" have occurred on timeline