Synonyms for Onionskin:

n.

onionskin (noun)
flimsy.
paper (noun)
paper, bond, manila, vellum, newsprint, Note paper, parchment, roofing paper, crepe, tissue, carbon paper, tarpaper, blotting paper, foolscap, cardboard, wax paper, rice paper, wall paper, papier-mache, wrapping paper, cellophane.

Other synonyms:

Other relevant words:
flimsy.