- diaphanous, filmy, gauzy, gossamer, see-through, sheer, transparent, vaporous, cobwebby - so thin as to transmit light; "a hat with a diaphanous veil"; "filmy wings of a moth"; "gauzy clouds of dandelion down"; "gossamer cobwebs"; "sheer silk stockings"; "transparent chiffon"; "vaporous silks"
Antonym: thick (indirect, via thin)