open-ended

adjectives

without fixed limits or restrictions
"an open-ended discussion"
is similar to
not subject to or subjected to restriction
allowing for a spontaneous response
"an open-ended question"
is similar to
not precisely determined or established; not fixed or known in advance
"of indeterminate age"; "a zillion is a large indeterminate number"; "an indeterminate point of law"; "the influence of environment is indeterminate"; "an indeterminate future"
allowing for future changes or revisions
"open-ended agreements"
is similar to
such that alteration is possible; having a marked tendency to change
"changeable behavior"; "changeable moods"; "changeable prices"