adjective
1
BAD : I look forward to hearing from you. Friendly, Leine.
GOOD : I look forward to hearing from you. Yours, Leine.
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See also YOURS 1 (↑ yours )
2
BAD : Although I was a stranger, they treated me very friendly.
GOOD : Although I was a stranger, the treatment I received was very friendly.
GOOD : Although I was a stranger, they treated me in a very friendly way.
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Friendly is an adjective (NOT an adverb): 'Our new neighbours are very friendly.' 'She gave me a friendly smile.'