In a dictatorial manner; in the style of a dictator; authoritarily and without regard for others' wishes.
From 'dictatorial' + '-ly' (adverbial suffix). The '-ly' suffix evolved from Old English '-lice' to form adverbs from adjectives.
When someone manages a team 'dictatorially,' they make all decisions alone and expect obedience without explanation—research shows this style actually reduces creativity and morale!
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