ADJ at n
The 'nervous' group
These adjectives indicate that someone reacts to a situation or to an idea in some way, for example, by being surprised, happy, or unhappy.
Half the people in the dining-room were staring at them, delightfully amused at this public quarrel between this apparently devoted couple.
Some people looked quite horrified at the idea of reading a new book.
He professed himself nervous at the prospect of making a speech in honour of Frank.
Hearing divorced people talk, I am sad at the overwhelming bitterness of their words.
The preposition at is sometimes followed by an '-ing' clause.
aghast agog alarmed amused anxious appalled ashamed astonished astounded bemused bitter disappointed disgusted dismayed displeased distraught guilty gutted happy heartbroken horrified hysterical impatient jubilant nervous overjoyed perturbed pleased puzzled sad sick surprised thrilled uneasy unhappy
She felt guilty at having been spared when so many others were dying.
'I was not very happy at being referred to as a toad.'
Bernard was unhappy at having to have his picture taken.