1. 不须花钱的：costive 便秘的 | costless 不须花钱的 | costliness 高价
2. 不须花钱的, 无须付出代价的：costive || 便秘的, 沉默寡言的, 行动迟缓的, 小气的 | costless || 不须花钱的, 无须付出代价的 | costliness || 高价, 奢侈, 昂贵
1. Posing as reporters has become a nearly costless yet profitable means of living in Xinzhou because there are concentrations of coalmines.
2. danci.911cha.com
2. Yet as was true when the crippling financial crisis gestated on Wall Street, there is no such free lunch as costless gains.
adj
1. costing nothing
e.g. complimentary tickets
free admission
Synonym: complimentary free gratis(p) gratuitous