Where does “doilleeid” come from?

doilleeid (Manx) comes from Manx doillee, from Middle Irish doilig, from Old Irish do-, from Proto-Celtic dus-, from Proto-Indo-European dus-, from Proto-Indo-European dēwǝ- — to fail, be behind, be lacking.

doilleeid (Manx): toughness, stiffness; difficulty, hardship,...

Definitions

toughness, stiffness; difficulty, hardship,...

Ancestry of “doilleeid”, step by step

Step	Language	Word	Meaning
1	Manx	doillee	difficult; stiff, hard; ticklish
2	Middle Irish	doilig	—
3	Old Irish	do-	impossible, extremely difficult; ill, evil;...
4	Proto-Celtic	dus-	bad
5	Proto-Indo-European	dus-	bad
6	Proto-Indo-European	dēwǝ-	to fail, be behind, be lacking

Every word from Proto-Indo-European dēwǝ- →Every word from Proto-Indo-European dus- →Every word from Old Irish do- →