In a genial manner; warmly, pleasantly, and good-naturedly; with friendliness and cheerfulness.
From 'genial' plus the English adverb-forming suffix '-ly.' The suffix '-ly' transforms adjectives into adverbs showing how or in what manner an action is performed, a standard pattern in English grammar.
Just by adding '-ly' to an adjective, English lets you instantly describe HOW something happens—'genially' tells you someone is being friendly while doing something, which is super efficient grammar!
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