adverb, adverb taking the 'to' particle
staringly; scrutinizingly
Describes staring at someone or something openly and persistently, often with a rude or curious nuance. Frequently used with 見る.
A stranger was staring at my face.
It's rude to stare at someone's house.
I felt uncomfortable being stared at by a stranger on the train.
He stared openly at the face of the person he had just met.