Where does “léanmhar” come from?

léanmhar (Irish) comes from Irish -mhar, from Old Irish -mar, from Old Irish már, from Proto-Celtic māros, from Proto-Indo-European moh₁ros, from Proto-Indo-European meh₁- — to measure.

léanmhar (Irish): painful, agonizing, harrowing, dire, afflictive

Definitions

painful, agonizing, harrowing, dire, afflictive

Ancestry of “léanmhar”, step by step

Step	Language	Word	Meaning
1	Irish	-mhar	-y
2	Old Irish	-mar	generates adjectives from nouns
3	Old Irish	már	Alternative form of mór; great
4	Proto-Celtic	māros	big, great
5	Proto-Indo-European	moh₁ros	great
6	Proto-Indo-European	meh₁-	to measure

Every word from Proto-Indo-European meh₁- →Every word from Proto-Indo-European moh₁ros →Every word from Proto-Celtic māros →