a. not yet payable
a. not appropriate or proper (or even legal) in the circumstances
s. lacking justification or authorization
a. 不适当的, 过度的, 未到期的
[经] 未到(支付)期的
1. The teacher gave the students undue stress before the exam.
老师在考试前给学生们施加了不必要的压力。
2. She felt that the criticism was undue and unfair.
她觉得这种批评是不必要的和不公平的。
3. It's important to avoid undue influence when making decisions.
在做决定时，避免不当影响是很重要的。