How to pronounce 唔關事 in Cantonese (4 out of 5):

絕對唔關事呀下
It's not that important.

Cantonese Sentence Breakdown

絕對 zyut6 deoi3
absolutely
唔關事 m4 gwaan1 si6
not related to…(something or someone); to be of no relevance
haa1
(particle equivalent to 啊 after a vowel, expressing surprise or doubt)
haa6
down
downwards
below, under, underneath
lower
later
next (week etc)
second (of two parts)
to decline
to go down
to arrive at (a decision, conclusion etc)
inferior