मूर्खस्य पञ्चचिह्नानि गर्वो दुर्वचनं तथा ।
क्रोधश्च दृढवादश्च परवाक्येष्वनादरः ॥
mūrkhasya pañca-cihnāni garvo durvacanaṁ tathā |
krodhaś ca dṛḍha-vādaś ca para-vākyeṣv anādaraḥ ||
(Unknown source)
“Five characteristics of a fool: pride [alt., arrogance], harsh speech [alt., foul language], anger, stubbornness, and disregard of [alt., lack of respect for] others’ statements.”