Ambiguous:
* Ambiguous
* Uncertain
* Vague
* Indefinite
* Unclear
* Obscure
* Doubtful
* Questionable
* Open to interpretation
* Suspect
* Fuzzy
Deceptive:
* Deceitful
* Misleading
* Evasive
* Double-talking
* Shifty
* Cunning
* Dishonest
* Two-faced
Neutral:
* Open-ended
* Double-edged
* Paradoxical
* Ambivalent
* Contradictory
* Inconsistent
The best synonym to use will depend on the specific context and the meaning you want to convey.