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Definitions of undesirable:

noun:   one whose presence is undesirable
Example: "Rounding up vagrants and drunks and other undesirables"

adjective:   not desirable
Example: "Undesirable impurities in steel"

adjective:   not worthy of being chosen (especially as a spouse)

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Alternative Terms
exceptionable ill-favored inadmissible objectionable unacceptable unwanted unwelcome like-dislike undesired uninvited unsought unwished-for undesirable desirable unsuitable hegira preferable indesirable punishment aston-patterning-side-effects intellectualization neutralizer gorgeous hoopty engaging preferred fixator nanometer

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