Definition of "errant" in English

adjective

1. Straying from the proper course or standard, or outside established limits.

2. Roving around; wandering.

3. Prone to erring or making errors; misbehaving.

   • We ran down the street in pursuit of the errant dog.

4. (chiefly with a negative connotation, obsolete) Obsolete form of arrant (“complete; downright, utter”).

noun

1. A knight-errant.