What does this idiom mean: 'bone idle'?

[NinaSky]

Test No. incompl/advan-52 "Bones", question 4

It was quite simple really - he never did any work at all and was sacked for being bone ..........

(a) lazy
(b) useless
(c) idle
(d) inactive

Test No. incompl/advan-52 "Bones", answer 4

It was quite simple really - he never did any work at all and was sacked for being bone idle.

Correct answer: (c) idle

Your answer was: correct
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Hy,
What is the diffrence between bone idle and bone lazy? in my dictionary they appear as synonyms.

[Alan]

I don't know the expression bone lazy. In this sentence you need bone idle. You might like to know that there is an expression lazy bones which is used in a joking way to describe someone who won't get up and do something.
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[Nina]

Yes, I mistook lazy bones for bone lazy.
My mistake. Thank you again and have a nice day

[Rich7]

he was sacked? what exactly did you mean?

[Torsten]

If you are sacked, you lose your job, you get fired.
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