疏於

to fail to pay sufficient attention to / to be negligent in regard to / to be lacking in

variant of 疏[shu1]

surname Shu

to dredge / to clear away obstruction / thin / sparse / scanty / distant (relation) / not close / to neglect / negligent / to present a memorial to the Emperor / commentary / annotation

surname Yu / Taiwan pr. [Yu2]

(literary) Oh! / Ah!

(of time or place) in; at; on / (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for / (indicating a source) from; out of / (used in comparison) than / (used in the passive voice) by

to neglect to take precautions / relaxed vigilance