unsuitable

Something that's unsuitable doesn't work well or is out of place. A kitchen knife is unsuitable for sawing firewood.

You can use the adjective unsuitable to describe something that isn't well suited for a use: flip flops are unsuitable shoes to wear in a blizzard. It's also a good word for something that's disappointing or undesirable: "No, that guy in the clown suit would be a completely unsuitable boyfriend for me." At the root of unsuitable is the meaning of suit, "be agreeable or convenient," that's thought to come from "provide a suit of clothes."

Definitions of unsuitable
1

adj not meant or adapted for a particular purpose

“a solvent unsuitable for use on wood surfaces”
Synonyms:
unfit
below the required standards for a purpose

adj not worthy of being chosen (especially as a spouse)

Synonyms:
undesirable
ineligible
not eligible

adj not conducive to good moral development

“the movie is unsuitable for children”
Synonyms:
bad
having undesirable or negative qualities

adj not capable of being applied

Synonyms:
inapplicable
irrelevant
having no bearing on or connection with the subject at issue

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