beady
adjective disapproving uk/ˈbiː.di/ us/ˈbiː.di/
（眼睛）珠子般亮晶晶的;（尤指像鸟的眼睛）小而明亮的
(of eyes) small and bright, especially like a bird's eyes
His beady little eyes were fixed on the money I held out. 他那双贼亮的小眼睛盯着我拿出来的钱。
She's always got her beady eyes on what I'm doing (= she watches me closely). 她那双贼亮的小眼睛总是密切注视我的一举一动。