overgeneralize

[ oh-ver-jen-er-uh-lahyz ]
/ ˌoʊ vərˈdʒɛn ər əˌlaɪz /

verb (used with or without object), o·ver·gen·er·al·ized, o·ver·gen·er·al·iz·ing.

to generalize beyond appropriate or justified limits.
Also especially British, o·ver·gen·er·al·ise.

Origin of overgeneralize