Webster's Revised Unabridged Dictionary · 1913

Incompatible

Incompatible , adjective

[Prefix in- not + compatible: compare French incompatible.]

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.
(Chemistry) Incapable of being together without mutual reaction or decomposition, as certain medicines.
Collocations (1)
Incompatible terms (Logic) , terms which can not be combined in thought.

Incompatible , noun

(Medicine & Chemistry) 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.