be, seem | become
The origins of the tradition have become obscure.

remain
The motives behind this decision remain somewhat obscure.

extremely, very | completely, totally | largely | fairly, rather, relatively, somewhat

completely, totally | almost | largely | half, partially, partly, slightly, somewhat | deliberately
All trace of his working-class background was deliberately obscured

easily
Solo passages in this register are very easily obscured by other instruments.

serve to, tend to
The emphasis on social integration often served to obscure the real differences within the community.

allow sth to

behind/beneath
The moonwas obscured behind a wall ofcloud.

obscure the fact that …
These figures obscure the fact thata lot of older people live in greatpoverty.

obscure sth from view
The house was obscured from viewby a high hedge.