A sinch

adj.

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Totally simple. Used in a gloating context.

In use

Are ye tick or suhim? Das a sinch boy!

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Splendid, company at last. Would you like me to translate 'A sinch' in use for you?

Are you dim or something? That is simplicity itself, old boy!