English Reference
adjective

inconsistent

adj.
US /ˌɪnkənˈsɪstənt/ UK /ɪnkənsˈɪstənt/ in·con·sis·tent

  1. 01 B2 Upper Intermediate

    not staying the same in quality or behaviour; unpredictable.

    lacking a steady or uniform quality over time; erratic in performance or behaviour.

    Simple

    The team lost the game because their defense was inconsistent throughout the season.

    In context

    The athlete's inconsistent performance during the qualifiers raised concerns about her ability to maintain focus under the pressure of the finals.

    Usage

    Often used to describe performance, quality, or human behaviour.

  2. 02 B2 Upper Intermediate Academic Logic

    containing parts that do not agree with each other or with the facts.

    displaying a lack of logical harmony or agreement between different elements, statements, or findings.

    Simple

    The witness gave an inconsistent account of what happened that night.

    In context

    The researcher noted that the new data was inconsistent with previous findings, suggesting a need for a complete revision of the theory.

    Usage

    Commonly followed by the preposition 'with'.

Usage inconsistent with

Nigeria’s electricity supply is notoriously inconsistent, and many households receive only a few hours of power each day.

Al Jazeera· 16 Aug 2026

The questions and product definitions used in these surveys can also be inconsistent.

The Conversation· 17 Aug 2026

From in- + consistent.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated