erratic

/ɪˈɹætɪk/adjective

Behaving or happening in an unpredictable, irregular way; lacking any steady pattern.

Example sentences

“His driving was so erratic that we asked him to pull over.”
“The patient's heartbeat became erratic during the night.”

Describes driving, behavior, heartbeats, and form in sport. Geologists call a boulder left behind by a glacier an erratic.

Related words

eruditeA person with deep knowledge gained through serious study; a scholar.eraserA small tool, usually made of rubber, used to rub out marks made with a pencil or pen.esotericMeant for or understood by only a small circle of people who share special knowledge or interests.eradicateTo pull a plant completely out of the soil, roots and all; to remove something entirely from its source.espouseTo take someone as a husband or wife; to marry.equivocalA word or phrase that can be understood in more than one way; an ambiguous expression.