ὀργίζεσθαι

From LSJ

γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → the fool laughs even when there's nothing to laugh at

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ὀργίζω): rage, be angry at, be angry with, be angry

Lexicon Thucydideum

irasci, to become angry, 1.32.1, 1.74.2, 1.77.4, 1.122.1, 1.133.1, 1.143.5, 2.60.5, 4.123.3, 4.128.4, 5.44.3. 5.52.1, 5.62.2. 6.60.2, 6.89.3. 8.1.1, 8.84.5, 8.86.5, 8.92.9,
ira, anger, 2.59.3.