obscure
verb
make less visible or unclear
“The stars are obscured by the clouds”
“the big elm tree obscures our view of the valley”
make unclear, indistinct, or blurred
“Her remarks confused the debate”
“Their words obnubilate their intentions”
make obscure or unclear
“The distinction was obscured”
reduce a vowel to a neutral one, such as a schwa
make undecipherable or imperceptible by obscuring or concealing
“a hidden message”
“a veiled threat”
adjective
not clearly expressed or understood
“an obscure turn of phrase”
“an impulse to go off and fight certain obscure battles of his own spirit”
Synonymsvaguemarked by difficulty of style or expression
“much that was dark is now quite clear to me”
“those who do not appreciate Kafka's work say his style is obscure”
Synonymsdarkdifficult to find
“hidden valleys”
“a hidden cave”
Synonymshiddennot famous or acclaimed
“an obscure family”
“unsung heroes of the war”
not drawing attention
“an unnoticeable cigarette burn on the carpet”
“an obscure flaw”
Synonymsunnoticeableremote and separate physically or socially
“existed over the centuries as a world apart”
“preserved because they inhabited a place apart”
Source: WordNet 3.1, Princeton University