Collins Chinese Dictionary Plus (3rd edition), 2011:
怠慢 dàimàn
I 动
slight
- 他怠慢了客人。 Tā dàimànle kèren. He slighted the guests.
II 形
(谦) remiss
- 如有怠慢之处(處),请(請)多包涵。 Rú yǒu dàimàn zhī chù,qǐng duō bāohan. If I have been at all remiss, please accept my full apologies.