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The adverbial form is in a friendly way. Friendly is an adjective: a friendly game, to have friendly relations with one's neighbours, etc
Truth isn't an adjective but a noun. The adjective is true, and we use it with no article between it and the verb to be.
The possessive adjective its is correctly written without the apostrophe. So also hers, ours, yours, theirs take no apostrophe.