unconsistent

Adjective

inconsistent (comparative more inconsistent, superlative most inconsistent)

1. Not compatible (with another thing); incompatible, discrepant, at odds.
   • His account of the evening was inconsistent with the security-camera footage.

   Antonyms:

   consistent

2. Lacking internal consistency; self-contradicting; not compatible with itself.
   • He gave an inconsistent account of the evening, saying he called her before eight, but later that he had not talked to her until after nine.

   Synonyms:

   spotty, mixed

   Antonyms:

   consistent

3. Not consistent or coherent in thought or behavior.
   • “Take him for better or worse,” added Mr. Lee, “and I think he is the strangest and most inconsistent man I ever saw.”
   • “Inconsistent!” resumed Mr. Jones. “He is worse than inconsistent. Inconsistencies may be pardoned as constitutional defects [...]”1848, The Columbian Magazine, volume 9, page 88

   Antonyms:

   consistent

4. Having the property that a contradiction can be derived.

   Antonyms:

   consistent