Overgeneralizer

Part of speech: noun

Definitions

1. A person who applies a rule or conclusion too widely, drawing general claims from only a few examples or cases
2. Someone who makes sweeping statements about whole groups or categories based on insufficient or unrepresentative information
3. A thinker prone to extending particular observations into universal rules that the evidence does not actually support

Etymology: "Overgeneralizer" is formed from "overgeneralize" plus the agent suffix "-er," so it names a person (or sometimes a thing) that overgeneralizes. The base verb is itself a compound: "over-" in the sense of "excessively," attached to "generalize," which comes from "general," the Latin-derived adjective meaning "relating to the whole" (from "generalis," "of a kind or class"). To generalize is to draw a broad conclusion from limited evidence, and the prefix adds the sense of going too far with that move. The word is a plain, transparent formation rather than a coinage with a famous backstory. Its meaning follows directly from its parts: the verb describes the error, and the "-er" suffix turns it into a label for whoever commits it, most often in discussions of language learning and psychology, where a child who applies a rule to every case (such as adding "-ed" to every verb to form the past tense) is called an overgeneralizer.