inconsistent
UK: ˌɪnkənˈsɪstənt | US: ˌɪnkənˈsɪstənt
adj. lacking consistency; not staying the same in behavior, quality, or attitude
adj. containing parts that disagree with one another; logically contradictory
The word "inconsistent" originates from Latin roots. The prefix "in-" negates the following morphemes, while "con-" (from Latin "cum") means "together." The root "sist" comes from Latin "sistere," meaning "to stand." Combined, "consist" originally meant "to stand together" (i.e., to be coherent or stable). Adding "in-" reverses this, implying a failure to hold together logically or behaviorally. The suffix "-ent" turns it into an adjective. Over time, the word evolved to describe contradictions or unpredictability.
His inconsistent performance made it hard to rely on him.
The witness gave inconsistent statements during the trial.
The data was inconsistent with the previous findings.
Her mood swings were so inconsistent that no one could predict her reactions.
The team's inconsistent results reflected their lack of preparation.