Bad / Nervous
defensive - To put oneself in a position that is intended to protect oneself.
One of the challenges of a therapist is to achieve the trust of the patient, and overcome the patient's defensive behavior.
fidgety - Being restless, impatient, and uneasy, and making small bodily movement that reveals that condition.
At first the criminal appeared confident under questioning, but as the hours passed, he started losing his cool and became fidgety.