In a friendly manner; with warmth, kindness, and openness toward others.
From 'friendly' (friend plus '-ly' adjectival suffix) plus '-ly' (adverbial suffix forming adverbs). This creates a double '-ly' structure common in older English.
English is weird about adverbs—'friendlily' sounds awkward because we rarely say it (preferring 'in a friendly way'), yet it's completely grammatical, showing how language and actual usage diverge.
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