Synonyms and related words :
charitable, complimentariness, complimentary, costless, costlessness, eleemosynary, expenseless, expenselessness, for free, for love, for nothing, free, free as air, free for nothing, free gratis, free of charge, free of cost, free ride, freeness, gift, giftlike, given, gratis, gratuitous, gratuitousness, gratuity, labor of love, no charge, on the house, unbought, unpaid-for, untaxed, without charge