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Noun1.brain-fag - exhaustion that affects mental keennessbrain-fag - exhaustion that affects mental keenness
exhaustion - extreme fatigue
References in classic literature ?
And when I turned in my last examination paper I was in full possession of a splendid case of brain-fag.
Granted my prodigious brain-fag, nevertheless, had I never drunk in the past, the thought would never have entered my mind to get drunk now.