complimentary
com-pli-men-ta-ry
adjective
Given free of charge, often as a courtesy or bonus.
"Guests receive complimentary breakfast with their stay."
adjective
Expressing praise, admiration, or a polite compliment.
"She made a complimentary remark about his new suit."
Thesaurus
Synonyms: costless, free, gratis, unpaid, gratuitous, laudatory, praising, panegyric, encomiastic, panegyrical, eulogistic, praiseful
Antonyms: uncomplimentary