Worsen
Part of speech: verb
Definition: To make worse. To become worse; to get worse.
Aggravate
Part of speech: verb
Definition: To make worse, or more severe; to render less tolerable or less excusable; to make more offensive; to enhance; to intensify.To give coloring to in description; to exaggerate; as, to aggravate circumstances. — William Paley.To exasperate; to provoke; to irritate.