complimentary

If you say something complimentary, like "Grandma, that plastic flower looks so pretty in your hair," you are flattering, praising or admiring someone.

"Resembling a compliment" is one way to define the word complimentary, when you use it in the sense of giving praise. A second meaning of complimentary is "free." If your hotel includes breakfast with the price of your room, they may call it a complimentary breakfast. It's easy to get complimentary confused with complementary, which sounds exactly the same but means "filling in or completing."

Definitions of complimentary
  1. adjective
    conveying or resembling a compliment
    “a complimentary remark”
    Synonyms:
    encomiastic, eulogistic, panegyric, panegyrical
    formally expressing praise
    laudatory, praiseful, praising
    full of or giving praise
    favorable, favourable
    encouraging or approving or pleasing
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    Antonyms:
    uncomplimentary
    tending to (or intended to) detract or disparage
    belittling, deprecating, deprecative, deprecatory, depreciative, depreciatory, slighting
    tending to diminish or disparage
    derogative, derogatory, disparaging
    expressive of low opinion
    dislogistic, dyslogistic, pejorative
    expressing disapproval
    sneering, snide, supercilious
    expressive of contempt
    unfavorable, unfavourable
    not encouraging or approving or pleasing
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  2. adjective
    costing nothing
    complimentary tickets”
    synonyms: costless, free, gratis, gratuitous
    unpaid
    not paid
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