1670s, "belonging to a large group of objects," formed in English from Latin gener-, stem of genus "kind" (see genus) + -ic. Sense of "not special, not brand-name; in plain, cheap packaging," of groceries, etc., is from 1977.
generic ge·ner·ic (jə-něr'ĭk)adj.
Of or relating to a genus.
Relating to or descriptive of an entire group or class; general.
Not having a trademark or brand name.
Inferior; cheesy, grotty: Larry King doesn't appear to be generic: he has a distinctive voice, and he doesn't look like anybody else (1980s+ Students)