Source : Webster's Revised Unabridged Dictionary (1913)

Incompatible \In`com*pat"i*ble\, n. (Med. & Chem.)
   An incompatible substance; esp., in pl., things which can not
   be placed or used together because of a change of chemical
   composition or of opposing medicinal qualities; as, the
   incompatibles of iron.

Incompatible \In`com*pat"i*ble\, a. [Pref. in- not + compatible:
   cf. F. incompatible.] [It was formerly sometimes written
   {incompetible}.]
   1. Not compatible; so differing as to be incapable of
      harmonious combination or coexistence; inconsistent in
      thought or being; irreconcilably disagreeing; as, persons
      of incompatible tempers; incompatible colors, desires,
      ambition.

            A strength and obduracy of character incompatible
            with his meek and innocent nature.    --Southey.

Source : WordNet®

incompatible
     adj 1: not compatible; "incompatible personalities"; "incompatible
            colors" [ant: {compatible}]
     2: used especially of drugs or muscles that counteract or
        neutralize each other's effect [syn: {antagonistic}] [ant:
         {synergistic}]
     3: not suitable to your tastes or needs; "the uncongenial
        roommates were always fighting"; "the task was uncongenial
        to one sensitive to rebuffs" [syn: {uncongenial}] [ant: {congenial}]
     4: incapable of being used with or connected to other devices
        or components without modification [ant: {compatible}]
     5: of words so related that one contrasts with the other;
        "`rich' and `hard-up' are contrastive terms" [syn: {contrastive}]
     6: not easy to combine harmoniously [syn: {ill-sorted}, {mismated},
         {unsuited}]
     7: not compatible with other facts [syn: {discrepant}]
     8: not in keeping with what is correct or proper; "completely
        inappropriate behavior" [syn: {inappropriate}, {out or
        keeping(p)}, {unfitting}]
     9: used especially of solids or solutions; incapable of
        blending into a stable homogeneous mixture