passive-aggressive

Short definition from Wiktionary

Adjective

1. 1
   Showing passive, sometimes obstructionist resistance to following authoritative instructions in interpersonal or occupational situations.
2. 2
   Showing covert hostility, intending to cause annoyance or to humiliate, while maintaining a transparent (to the recipient) veneer of politeness.
3. 3
   Alternative form of passive-aggressive.