Daft, previously designated On the Radar, is edging perilously close to a proper NOOB. From a Richard Sandomir article about Magic Johnson and AIDS in today’s New York Times:
“Science caught up to the public optimism that made Johnson sound daft or in deep denial on the day of his announcement.”
Your thoughts?
notoneoffbritishisms.com 
“Daft” is a highly useful word which conveys a unique shade of meaning about the stupidity on offer, and there is no good reason it should not enrich American vocabulary. Also on offer from the Northern (British) lexis is the equally useful “gormless”, but I’ll go to the foot of our stairs (as we say in Yorkshire) if that becomes a NOOB.
I think that “daft” works, and can be used unselfconsciously in AmE.
It’s not “a daft” merely ‘daft’ (adjective) Scottish origin.