Sentence:  He expected Concetta 's thin hand to reach down to grasp the boy , and her shrill , <WSD>impetuous</WSD> voice to sound against the rotundity of his disfigured flesh that was never sure of hearing anything . 
Meaning of the word marked with <WSD> tags:  characterized by undue haste and lack of thought or deliberation; (`brainish' is archaic)