critically

The story

1. Proto-Indo-European*krey-
2. Proto-Indo-European*krinyéti
3. Proto-Hellenic*kríňňō
4. Ancient Greekκρῑ́νω (krī́nō)
5. Ancient Greekκρῐ- (krĭ-)
6. Ancient Greekκρῐτής (krĭtḗs)
7. Ancient Greekκριτικός (kritikós)
8. Latincriticus
9. Proto-Indo-European*h₂el-
10. Proto-Indo-European*h₂élisder.?
11. Englishcritical
12. Proto-Indo-European*leyg-
13. Proto-Germanic*līką
14. English todaycritically

From critical + -ly.