State or quality of being nervous.

the anxious feeling you have when you have the jitters

an uneasy psychological state; "he suffered an attack of nerves"

a sensitive or highly strung temperament

Behavior changes and emotional difficulties are commonly ascribed with mercury poisoning.

The characteristic in an MRP system when minor changes in higher level (e.g., level 0 or 1) records or the master production schedule cause significant timing or quantity changes in lower level (e.g., level 5 or 6) schedules and orders.