"an obscure turn of phrase"
"an impulse to go off and fight certain obscure battles of his own spirit"
"their descriptions of human behavior become vague, dull, and unclear"
"vague...forms of speech...have so long passed for mysteries of science"

"much that was dark is now quite clear to me"
"those who do not appreciate Kafka's work say his style is obscure"

"hidden valleys"
"a hidden cave"
"an obscure retreat"

"an obscure family"
"unsung heroes of the war"

"an unnoticeable cigarette burn on the carpet"
"an obscure flaw"

"existed over the centuries as a world apart"
"preserved because they inhabited a place apart"
"tiny isolated villages remote from centers of civilization"
"an obscure village"

"The stars are obscured by the clouds"
"the big elm tree obscures our view of the valley"

"Her remarks confused the debate"
"Their words obnubilate their intentions"

"The distinction was obscured"

"a hidden message"
"a veiled threat"