Is it Ok to say i am a lazy person and i love to sit idle. Should we use sit idly here?

Thanks a ton in advance
The adverb is idly; however, "... while the CPU sits idle" is a phrase I've seen very often. The idiom "to sit idly by" means that you do nothing to help.
so, can we say I like to sit idle as I am a lazy person, as the correct adverb that should be used here is idly. M confused hereEmotion: phew
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I have the feeling that 'to sit idle' turned into a verb phrase, similar to the verb phrase 'to sit tight' instead of the verb+adverb 'to sit tightly'.

It is not in the dictionary, though.