Synonyms of dense in English:

dense


See US English definition of dense

See UK English definition of dense

See Spanish definition of espeso

adjective

1‘she stumbled through a dense birch forest’

SYNONYMS
close-packed, closely packed, tightly packed, closely set, thick, packed, crowded, crammed, jammed together, compressed, compacted, compact, solid, tight
overgrown, jungle-like, jungly, impenetrable, impassable
archaic thickset
ANTONYMS

sparse

2‘a fire can fill your home with dense smoke’

SYNONYMS
thick, heavy, opaque, soupy, murky, smoggy, impenetrable
concentrated, condensed, of high density
ANTONYMS

thin, light

3‘they were dense enough to believe me’

SYNONYMS
stupid, unintelligent, ignorant, brainless, mindless, foolish, slow, slow-witted, dull-witted, witless, doltish, blockish, dunce-like, simple-minded, empty-headed, vacuous, vapid, half-witted, idiotic, moronic, imbecilic, obtuse, bovine, lumpish
gullible, naive
informal thick, dim, dumb, dopey, dippy, dozy, cretinous, thickheaded, chuckleheaded, dunderheaded, wooden-headed, fat-headed, thick-skulled, muttonheaded, boneheaded, lamebrained, birdbrained, pea-brained, pig-ignorant, slow on the uptake, soft in the head, brain-dead, dead from the neck up
British informal daft, not the full shilling, as thick as two short planks
South African informal dof
West Indian informal dotish
North American vulgar slang dumb-ass
ANTONYMS

clever