The story
- Proto-Indo-European*sem-
- Proto-Indo-European*sm̥-
- Proto-Hellenic*hə-
- Ancient Greekᾰ̔- (hă-)
- Ancient Greekᾰ̔πλόος (hăplóos)
- Englishhaplo-
- Englishinsufficient
- English todayhaploinsufficient
From haplo- + insufficient.
Etymology from Wiktionary, CC BY-SA 4.0.