The book Living with the Passive-Aggressive Man lists 11 responses that may help identify passive-aggressive behavior. ^[2]

• Ambiguity or speaking cryptically: a means of engendering a feeling of insecurity in others
• Chronically being late and forgetting things: another way to exert control.
• Fear of competition
• Fear of dependency
• Fear of intimacy as a means to act out anger: The passive aggressive often can’t trust. Because of this, they guard themselves against becoming intimately attached to someone.
• Making chaotic situations
• Making excuses
• Obstructionism
• Sulking
• Victimization response: instead of recognizing one’s own weaknesses.

A passive-aggressive person may not have all of these behaviors, and may have other non-passive-aggressive traits.

Reference : http://www.wikipedia.com

Image source : http://www.passiveaggressivenotes.com/