ADJ by n
The 'astonished' group
These adjectives indicate that someone reacts in some way to a person, a thing, or a situation. The noun group following the preposition by indicates the person, thing, or situation that causes the reaction.
abashed absorbed alarmed amused annoyed appalled astonished astounded awestruck bedazzled bemused concerned confused convinced cowed daunted disappointed disgruntled disgusted disheartened dismayed downcast downhearted dumbstruck exasperated fascinated flabbergasted heartbroken gobsmacked heartened impressed intrigued moved obsessed perturbed pleased preoccupied puzzled smitten spellbound stricken surprised threatened thrilled thunderstruck unabashed unconcerned unconvinced undaunted undeterred undismayed unimpressed unmoved unnerved unperturbed unswayed unworried uplifted upset worried
I stood utterly astonished by what I'd done.
Like their fellow Europeans, the British are exasperated by rising crime.
After the game he said, "I'm absolutely gobsmacked by the referee's decision - it is an insult as far as I'm concerned".
Montagu was extremely impressed by the splendours of the French court.
You find out quickly who your real friends are; others melt away because they feel threatened by the illness.
Analysts are worried by the fact that private investment - the economy's other main driver - is shrinking rapidly.