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Someone who is easily frightened can be described as skittish, timid, or jumpy.
i believe you refer to a contortionist ?
you call them able?
you call them able?
linguist, polyglot
short-fused. My wife.
It depends on the situation. If your house or something is on fire that you cannot easily control or put out yourself, call the fire department. If someone is robbing your house, you should call the police, not the fire department.Call an ambulance or the police.
A person who easily gets offended and retaliates can be described as having a "short fuse" or being "vindictive."
a souvenir
Unscratchable? I am not sure if that is the kind of word that you are looking for...
...registration?
That is asault and you can call the police.