Definition of "erratic" in English

adjective

1. Unsteady, random; prone to unexpected changes; not consistent.

   • Henry has been getting erratic scores on his tests: 40% last week, but 98% this week.

2. Deviating from normal opinions or actions; eccentric; odd.

   • erratic conduct

noun

1. (geology) A rock moved from one location to another, usually by a glacier.

2. Anything that has erratic characteristics.