The Collaborative International Dictionary
Lethargize
Lethargize \Leth"ar*gize\ (l[e^]th"[.a]r*j[imac]z), v. t. [imp. & p. p. Lethargized (-j[imac]zd); p. pr. & vb. n. Lethargizing (-j[imac]`z[i^]ng).] To make lethargic.
All bitters are poison, and act by stilling, and
depressing, and lethargizing the irritability.
--Coleridge.
Wiktionary
lethargize
vb. To make lethargic.