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Adjective: immotile  i'mow-t(u)l or i'mow,tI(-u)l [N. Amer], i'mow,tI(-u)l [Brit]
  1. (of spores or microorganisms) not capable of movement
    "The immotile bacteria were easily filtered out";
    - nonmotile

See also: immobile

Encyclopedia: Immotile