[DanaC]

I did not realise that's what peruse meant! I absolutely use it to mean the opposite (read through lightly, in a relaxed fashion - glance at - etc as opposed to read thoroughly and carefully)

But 'nonplussed' I use as it appears in the dictionary - I hadn't realised others were using it to mean something else...how is it used then by those people?

This is how I use it:

Adjective
(of a person) Surprised and confused so much that they are unsure how to react.
(of a person) Unperturbed.