A state of terror excited by the sudden appearance of danger; sudden and violent fear, usually of short duration; a sudden alarm.
Someone strange, ugly or shocking, producing a feeling of alarm or aversion.
frightened; afraid; affright
Agitation; the state of being perturbed
Variation in an orbit due to the influence of external bodies
A small change in a physical system, or more broadly any definable system (such as a biological or economic system)