Adjective

(en adjective)

Unaffected or unable to be affected by.

*

, title=(The Celebrity), chapter=5 , passage=Although the Celebrity was almost impervious to sarcasm, he was now beginning to exhibit visible signs of uneasiness, the consciousness dawning upon him that his eccentricity was not receiving the ovation it merited.}}

Preventive of any penetration; impenetrable, impermeable, particularly of water.

Immune to damage or effect.

Adjective

(en adjective)

Making arbitrary decisions, especially in an impulsive and forceful manner.

* 1880 , John Weeks Moore, Complete Encyclopaedia of Music , "":

But it was natural, that the impetuous , restless young artist should incline more to excess of strength than of delicacy in his playing.

Characterized by sudden and violent force.

* 1794 , :

He stands, and views in the faint rays
Far, far below, the torrent's rising surge,
And listens to the wild impetuous roar