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Adjective: unsuitable  ,ún'soo-tu-bul
  1. Not meant or adapted for a particular purpose
    "a solvent unsuitable for use on wood surfaces"
  2. Not capable of being applied
    "rules unsuitable to day students";
    - inapplicable
  3. Not conducive to good moral development
    "the movie is unsuitable for children"
  4. Not worthy of being chosen (especially as a spouse)
    - undesirable

See also: bad, beside the point, ineligible, irrelevant, unfit