By studying the suffix from Latin impetus means "an impulse", so impetuous most likely means a person that acts quickly and without thought or care, by impulse and the heat of the moment.
A suffix, also known as ending, is an affix or morpheme which is attached after the root of a word to form a new word.
Specifically, the suffix <em>-ous </em>is a suffix that forms adjectives which <em>expresses that a certain person or object possesses a given quality</em>. Therefore, by studying this suffix in the word “impetuous”, the reader can determine that such word is an adjective which means <em>possessing great impetus, characterized by sudden actions.</em>
