Which term refers to behavior that is not typical of someone's usual conduct?

The term that refers to behavior that is not typical of someone's usual conduct is uncharacteristic. This word is specifically used to describe actions or behaviors that deviate from an individual's normal patterns or habits. For instance, if a typically calm person reacts with anger in a situation, that reaction can be described as uncharacteristic for them. The focus of this term is on the difference from the established norm of behavior for that individual.

In contrast, characterized denotes specific traits or qualities that define someone's typical behavior, meritorious indicates something deserving of merit, and detracting refers to actions that take away from something or lessen its value. These terms do not convey the concept of behavior that is atypical or unexpected, which is essential in identifying the correct choice.