1.   A few moments of complete mental instability when you were unscrupulous enough to take advantage of me.

2.   Alex Household had a history of mental instability and paranoia.

3.   Her mental instability led her to commit these crimes.

4.   If Friedman had a history of mental instability, why was he let into the army?

5.   Once his mental instability was recognised, he was sent to hospital, but died of a heart attack in the ambulance.

6.   There had been, the broadcast added unexpectedly, a history of mental instability.

7.   This was no longer an affront to the public conscience, where the suicide resulted from mental instability.

8.   Would you consider going to a doctor if he developed any mental instability?