undeclared

As adjectives the difference between undecided and undeclared

is that undecided is open and not yet settled or determined while undeclared is not declared.

As a noun undecided

is a voter etc who has not yet come to a decision.

As adjectives the difference between hidden and undeclared

is that hidden is that has been moved out of sight invisible or unapparent while undeclared is not declared.

As a verb hidden

is .

As an adjective undeclared

is not declared.

As a verb undeclare is

to reverse the process of declaring; to unsay.

As an adjective undeclared

is not declared.

As a verb undeclares is

(undeclare).