incompatible terms
Webster's Dictionary (GCIDE)
Incompatible \In`com*pat"i*ble\, a. [Pref. in- not + compatible: cf. F. incompatible.] [It was formerly sometimes written incompetible.] [1913 Webster]
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. [1913 Webster]
A strength and obduracy of character incompatible with his meek and innocent nature.— Southey.[1913 Webster]
2.(Chem.) Incapable of being together without mutual reaction or decomposition, as certain medicines. [1913 Webster]
Incompatible terms (Logic), terms which can not be combined in thought.
Syn: Inconsistent; incongruous; dissimilar; irreconcilable; unsuitable; disagreeing; inharmonious; discordant; repugnant; contradictory. See Inconsistent. [1913 Webster]