different between idly vs illy

English

From Middle English idely, ydelly, idelliche, from Old English ?dell??e, equivalent to idle +? -ly.

idly (comparative more idly, superlative most idly)

Without specific purpose, intent or effort. [from 9th c.]
I idly played with the paper, not even realizing I was folding it into a paper airplane.
In an idle manner. [from 14th c.]

James A. H. Murray [et al.], editors (1884–1928) , “Idly”, in A New English Dictionary on Historical Principles (Oxford English Dictionary), volume V (H–K), London: Clarendon Press, OCLC 15566697, page 24, column 2.

ill +? -ly

illy (comparative more illy, superlative most illy)

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