"Jack-in-office" is a derogatory term often used to describe a person who abuses their authority or seeks to enforce rules and regulations without reason or compassion. Synonyms for this term include "petty tyrant," "bully," "authoritarian," "dictator," or simply "abusively dominant." These words emphasize the negative connotation associated with individuals who exert power over others in a manner that is unfair, unjust, or unyielding. Other related terms that could be used in lieu of "jack-in-office" are "domineering," "overbearing," "bossy," or "oppressive," all of which denote an excessive inclination towards exerting control over others in a way that is harmful or oppressive.