Your poem is a few centuries out of date. "Thou art" used to be the familiar singular of "you are." "Bonnie lass" still means "pretty girl" -- at least in Scotland (probably wouldn't be understood by many Americans). "Fair" means "light skinned" -- it used to be a synonym for "pretty." So: "As attractive as you are, my pet girl...."

it's a verse from a poem, isn't it? I'm sorry, but I'm not good at analysing poetry. I'd suggest you look it up.

Hi Nelson, This is Old Scots, so would never be used in a real life context. I imagine you read this? The sentence above is from a poem by Scottish Poet Robbie Burns. The meaning would be roughly 'you are a very beautiful girl' These days some of this words would still be used in the Scots dialect. Bonnie = beautiful lass = girl Here 'fair' would also mean pretty or beautiful. Christine