complimentary

complimentary (http://definr.com/complimentary)

     adj 1: conveying or resembling a compliment; "a complimentary
            remark" [ant: uncomplimentary]
     2: costing nothing; "complimentary tickets" [syn: costless, free,
         gratis(p), gratuitous]
     3: obsequiously complimentary; "they listened with flattering
        interest" [syn: adulatory]