Thick synonyms

Chunky, solid, stocky, thickse, crowded, dense, packed, glutinous, viscous, overflowing, swarming, teeming, opaque, unclear, dumb, stupid, chummy, close, friendly, pally, great, extreme.

Thin synonyms

Reedy, slender, slim, skinny, waif-ish, fine, lightweight, narrow, svelte.