WordNet sense 1 (lacking definite structure or organization):

unstructured

WordNet sense 2 (of uncertain or ambiguous nature):

indeterminate

WordNet sense 3 (having two meanings with intent to deceive):

double

WordNet sense 4 (open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead):

equivocal

WordNet sense 5 (ambiguous (especially in the negative)):

uncertain

WordNet sense 6 (ironically ambiguous):

left-handed

WordNet sense 7 (resembling an oracle in obscurity of thought):

enigmatic, oracular