He has an impetuous and irascible personality.

He has an impetuous and irascible character.

Tom is a solid and determined man, but sometimes he's as impetuous as a river of molten lava.

Don't be so impetuous.

She's so impetuous; I wish she would consider things before acting.

Especially was this the case with Daphnis, who, having passed the winter at home in inactivity, was more impetuous and pressing than ever in the caresses he bestowed on Chloe.

Your impetuous remarks about us seem to have rung down the curtain on our good relationship.