Synonyms for Evasive (same or very similar meaning)
WordNet sense 1 (intended or adapted to afford protection of some kind):
protectiveWordNet sense 2 (open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead):
ambiguousWordNet sense 3 (skillful at eluding capture):
elusiveWordNet sense 4 (marked by skill in achieving a desired end especially with cunning or craft):
artfulFrom the ODE community, based on WordNetadd/edit