godan verb (-ru)
seem amused; appear to find funny; look mystified
Describes someone showing signs of amusement or bewilderment, often used when the speaker observes another person's reaction. The verb おかしい (funny/strange) + がる (to show signs of) implies an outward display.
彼はその冗談をおかしがっていた。
He seemed amused by the joke.
子供
The children looked mystified by the magic trick.