Robert consistently arrives late for his appointments, which reflects which type of behavior?

Arriving late for appointments is primarily regarded as unprofessional behavior. This is because punctuality is a fundamental expectation in professional environments. Consistent lateness can signal a lack of respect for the schedules and time of others, which can harm professional relationships and workplace dynamics.

While such behavior may also be viewed as unethical—depending on the context—unprofessionalism is more directly tied to the expected standards of conduct in a professional setting. Unprofessional behavior can undermine a person's credibility and reliability, which are crucial in maintaining professional integrity and mutual respect in any professional engagement.

The other options do not apply as directly to the behavior in question. Immoral behavior typically refers to actions that contravene societal or personal moral standards, while illegal behavior pertains to violating laws. Unprofessional behavior focuses specifically on conduct that does not align with professional standards or expectations. Thus, consistent tardiness is best categorized under unprofessional behavior.