Ancient Greek λήθαργος

← Ancient Greek λήθη (affix)

← Ancient Greek ᾱ̓ργός (affix)

← Proto-Indo-European *leh₂- (root)

→ English lethargic (mention)

→ Czech letargie (mention)

→ Spanish letargo (derived)

→ Indonesian letargi (mention)

→ Latin lethargus (borrowed)