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Wiktionary
overgeneralize

vb. To discuss something in terms that are too general, and thereby ignore significant details or differences.

WordNet
overgeneralize

v. draw too general a conclusion; "It is dangerous to overgeneralize" [syn: overgeneralise]

Usage examples of "overgeneralize".

Local observations conducted during a few centuries of such a quiet period had led Earth's astronomers to overgeneralize such conditions as representing the permanent situation.