These words all describe a product or service that costs little money or less money than you expected.以上各词均指产品或服务花钱少或低于预期。
cheapcosting little money or less money than you expected; charging low prices指花钱少、便宜、收费低廉NOTECheap can also be used in a disapproving way to suggest that sth is poor quality as well as low in price. * cheap 亦可作贬义，指价低质劣：◆a bottle of cheap perfume一瓶低价劣质香水
competitive(of prices, goods or services) as cheap as or cheaper than those offered by other companies; able to offer goods or services at competitive prices指价格、产品或服务收费方面具有竞争力
budget[only before noun] (used especially in advertising) cheap because it offers only a basic level of service（尤用于广告）指仅提供基本服务因而价格低廉
affordablecheap enough for most people to afford指多数人买得起或负担得来的
reasonable(of prices) not too expensive指价格不太高、公道的
inexpensive(ratherformal) cheap指不昂贵NOTEInexpensive is often used to mean that sth is good value for its price. It is sometimes used instead of cheap, because cheap can suggest that sth is poor quality. * inexpensive 常含物有所值之义，有时用以代替 cheap，因为 cheap 可有质量低劣的含义。