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Lethargical
- Pertaining to, affected with, or resembling, lethargy; morbidly drowsy; dull; heavy.
Lethean
- Of or pertaining to Lethe; resembling in effect the water of Lethe.
- Causing forgetfulness and oblivion.
Letheon
- Sulphuric ether used as an an
Letheonize
- To subject to the influence of letheon.
Lethiferous
- Deadly; bringing death or destruction.