- Original: λήθη - Transliteration: Lethe - Phonetic: lay'-thay - Definition: 1. forgetfulness - Origin: from G2990 - TDNT entry: None - Part(s) of speech: Noun Feminine - Strong's: From G2990 ; forgetfulness: - + forget. Total KJV Occurrences: 1 • forgotten, 1 2 Peter 1:9