adjective
BAD : She is good at organizing people without seeming arrogant or official.
GOOD : She is good at organizing people without seeming arrogant or officious.
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official = done by or connected with a person or group in authority; formal: 'an official letter', 'an official inquiry', 'official approval'
officious (expressing dislike or disapproval) = too eager to give orders or make people keep to rules which are unimportant: 'An officious little man at the check-in insisted that my luggage was half a kilo overweight.'