inconsistent

Inconsistent describes something that's varied or irregular. So if you're supposed to floss every day, but you only remember every now and then, your commitment to oral hygiene could be called inconsistent.

The adjective inconsistent first came into use in the 1640’s, with the sense of “not agreeing in substance or form.” Broken down into its roots, in plus consistent, the word literally means "not consistent." Behavior, results in lab experiments, and your cooking skills could all be described as inconsistent if they are irregular, spotty, and hard to predict.

Definitions of inconsistent
  1. adjective
    displaying a lack of consistency
    inconsistent statements cannot both be true at the same time”
    inconsistent with the roadmap”
    Synonyms:
    at odds, conflicting, contradictory, self-contradictory
    in disagreement
    discrepant, incompatible
    not compatible with other facts
    scratchy, spotty, uneven
    lacking consistency
    unconformable
    not correspondent
    unreconciled
    not made consistent or compatible
    variable
    liable to or capable of change
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    Antonyms:
    consistent
    (sometimes followed by `with') in agreement or consistent or reliable
    accordant, agreeable, concordant, conformable, consonant
    in keeping
    pursuant
    (followed by `to') in conformance to or agreement with
    reconciled
    made compatible or consistent
    self-consistent
    not self-contradictory
    unchanging
    conforming to the same principles or course of action over time
    invariable
    not liable to or capable of change
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  2. adjective
    not in agreement
    synonyms: discrepant
    incongruous
    lacking in harmony or compatibility or appropriateness
  3. adjective
    not capable of being made consistent or harmonious
    inconsistent accounts”
    Synonyms:
    irreconcilable, unreconcilable
    impossible to reconcile
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