Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: gedæfte 'gentle'

daft

adjective
     
daft especially British English
1 silly:
a daft idea
Me, jealous? Don't be daft (=that is a silly idea).
She's as daft as a brush (=extremely silly).
2

be daft about something

to be extremely interested in something:
Tony's still daft about cars!
daftness noun [uncountable]

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