dense
/dens/
adjective
adjective: dense; comparative adjective: denser; superlative adjective: densest
1. closely compacted in substance.
"dense volcanic rock"
synonyms: thick, heavy, opaque, soupy, murky, smoggy; More
concentrated, condensed
"dense smoke"
antonyms: thin, light
•having the constituent parts crowded closely together.
"an estuary dense with marine life"
synonyms: thick, close-packed, tightly packed, closely set, close-set, crowded, crammed, compact, solid, tight; More
overgrown, jungly, impenetrable, impassable
"a dense forest"
antonyms: sparse
2. informal
(of a person) stupid.
synonyms: stupid, unintelligent, ignorant, brainless, mindless, foolish, slow, witless, simpleminded, empty-headed, vacuous, vapid, idiotic, imbecilic; informalthick, dim, moronic, dumb, dopey, dozy, wooden-headed, lamebrained, birdbrained, pea-brained; daft
"they were dense enough to believe me"
antonyms: clever
My favorite, Wooden Headed