Incompatible

Part of speech: noun (n.)

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.

Part of speech: adjective (a.)

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.

2. Incapable of being together without mutual reaction or decomposition, as certain medicines. Incompatible terms (Logic), terms which can not be combined in thought.

Synonyms: Inconsistent; incongruous; dissimilar; irreconcilable; unsuitable; disagreeing; inharmonious; discordant; repugnant; contradictory. See Inconsistent.