very idle; extremely lazy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for bone idle
Historical Examples of bone idle
They're both of them perfectly healthy, and yet they're bone-idle.
I don't know why he should have wanted a curate at all, except that he's so bone-idle, and I'm sure he can't afford one.