Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: lethargicus, from Greek, from lethargos 'forgetful, lazy', from lethe 'forgetfulness' + argos 'lazy'

lethargic

 adjective
     
le‧thar‧gic
feeling as if you have no energy and no interest in doing anything [= lazy]:
The hot weather was making us all lethargic.
—lethargically adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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