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adj. friend·li·er, friend·li·est
a. Characteristic of or behaving as a friend: a friendly greeting; is friendly with his neighbors.
b. Outgoing and pleasant in social relations: a friendly clerk.
c. Favorably disposed; not antagonistic: a government friendly to our interests.
a. User-friendly.
b. Informal Easy to understand or use for a specified agent. Often used in combination: a reader-friendly novel; a consumer-friendly policy.
c. Informal Low in amount relative to a standard or regular circumstance. Often used in combination: carbohydrate-friendly.
In the manner of a friend; amicably.
n. pl. friend·lies Informal
One fighting on or favorable to one's own side: "You're the only friendly we have there right now" (Tom Clancy).

friend′li·ly adv.
friend′li·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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She stood there, thinking of her own destiny, and the elder ladies talked on, until they had talked themselves into a decision to ask the young woman to luncheon, and tell her, very friendlily, how such behavior appeared to women like themselves, who knew the world.
Except for some stir it the branches and the flight of four startled magpies; there was neither life nor sound about the square house, but it looked out of its long windows most friendlily.
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