「安い」(yasui) is an い-adjective meaning "cheap" or "inexpensive." It describes the price of something and is the opposite of "高い" when referring to cost. For example, "安い服" (yasui fuku) means "cheap clothes."

「安(やす)い」(やすい)は「値(ね)段(だん)が安(やす)い」という意(い)味(み)のい形(けい)容(よう)詞(し)です。「高(たか)い」の反(はん)対(たい)です。例(れい)：「安(やす)いペン。」