unbuttoned
01
解开的, 未扣的
not fastened with buttons
例子
The shirt was left unbuttoned, giving a casual look.
衬衫没扣，给人一种随意的感觉。
02
放松的, 非正式的
relaxed and informal
例子
The musicians performed in an unbuttoned style, engaging the audience.
音乐家们以轻松和非正式的风格表演，吸引了观众。
