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For the fellow non native speakers: lethargic adj 1: deficient in alertness or activity; "bullfrogs became lethargic with the first

• miroljub 4y ago
  Lethargic and lethargies comes from the old Greek (or was it Latin, too lazy to check). It's a relatively common loan word in most of the European languages. My guess is that for most slightly educated non-native English speakers that word is more likely to be known than its English equivalent if it exists.