The Oxford Thesaurus An A-Z Dictionary of Synonyms - impersonaladj.

1) detached, objective, disinterested, fair, equitable, dispassionate, unprejudiced, unbiased: The enforcement of the law should be entirely impersonal. 2) formal, stiff, strait-laced, wooden, rigid, prim, stuffy, cool, detached, unfriendly, cold, mechanical: Why does my bank manager have to be so impersonal?