adj.(对爱情或友情)不忠的，不专一的

His affections were inconstant, often wandering from one person to another.
他的感情变幻莫测，常常从一个人转向另一个人。
The weather this week has been incredibly inconstant, alternating between rain and sunshine daily.
这周的天气变化无常，每天都阴晴不定。
She is an inconstant friend, always canceling plans at the last minute.
她是个善变的朋友，总是最后一刻取消计划。
His moods were inconstant, swinging wildly from happiness to sadness.
他的情绪起伏不定，时而开心，时而悲伤。
The inconstant support from her family made it hard for her to pursue her dreams.
家人不稳定的鼓励使她难以追求梦想。
The tides are said to be inconstant due to the gravitational pull of the moon.
据说由于月球的引力，潮汐是变化无常的。
In business, loyalty is essential; customers appreciate consistent service rather than inconstant promises.
在商业中，忠诚至关重要；顾客更喜欢始终如一的服务而非反复无常的承诺。
Her inconstant nature made it difficult for her to maintain long-term relationships.
她的善变性格让她很难维持长久的关系。
The teacher noticed that the student's attention was inconstant during the lecture.
老师注意到学生在讲座中的注意力并不集中。
The politician's policies were criticized for being inconstant, flip-flopping on key issues.
这位政客的政策因反复无常、关键问题上立场摇摆而受到批评。