M is for...

M is for mean

And...

S is for... the brain reused point blank to come up with some pithy little adjective. It is a rare thing to be at loss for words. Never the less one moved on...

T is for tyrannical.

E is for egregious.

R is for... still can't think of anything beginning with S

Supreme Being, He suggested helpfully

Um... no! Wrong direction entirely. It needs to be something horrid

Mean and totalitarian, egocentric, reprehensible.... The S just isn't coming

Slovenly He suggested. And one was almost inclined to agree until He carried on...

Lazy

Anal retentive

Vicious

Excuse making... no! Excuse ridden, He amended

You aren't helping... still stuck on S. Anyway, whenever one uses the term Master from now on you know what it means. Apart from that annoying S word...  do you really think that one is slovenly?

Well more slack He said, as though that was an improvement

And lazy?

Well it is probably more lax than lazy... when it comes to slave duties He added as an afterthought.

Yes M.A.S.T.E.R!

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You know self centred would work...