ambiguous - having more than one possible meaning; "ambiguous words"; "frustrated by ambiguous instructions, the parents were unable to assemble the toy"

unclear - not clear to the mind; "the law itself was unclear on that point"; "the reason for their actions is unclear to this day"

ambiguous, equivocal - open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead; "an equivocal statement"; "the polling had a complex and equivocal (or ambiguous) message for potential female candidates"; "the officer's equivocal behavior increased the victim's uneasiness"; "popularity is an equivocal crown"; "an equivocal response to an embarrassing question"

psychological science, psychology - the science of mental life

unstructured - lacking definite structure or organization; "an unstructured situation with no one in authority"; "a neighborhood gang with a relatively unstructured system"; "children in an unstructured environment often feel insecure"; "unstructured inkblots"