Query about Question 5 from "(I'm Overwhelmed) Module Vocab Quiz #3 (words 81-120)" [7081]

https://www.gregmat.com/quizzes/quiz/im-overwhelmed-module-vocab-quiz-3-words-81-120 (Question 5)


Here in the final question why is the answer not dilatory. The question statement is as follows:

His ______ explanation was unnecessary and time-consuming.

here based on the ending of the statement we can understand that the dilatory fits perfectly since it means slow and unhurried, meant to stall. Can anyone explain why “verbose” is the answer instead.
I think verbose fits perfectly for question 7 instead:

His answers to the questions were ____ and seemed off-topic.