Synonyms of open ended

Adjective

1. open-ended, unrestricted (vs. restricted)

usage: without fixed limits or restrictions; "an open-ended discussion"

2. open-ended, indeterminate (vs. determinate), undetermined

usage: allowing for a spontaneous response; "an open-ended question"

3. open-ended, changeable (vs. unchangeable), changeful

usage: allowing for future changes or revisions; "open-ended agreements"