from The Century Dictionary.
- noun Mental fatigue or exhaustion, as from overwork.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A condition to which male high school and college students are prone consisting of difficulty in concentrating, mild forgetfulness, and difficulty in maintaining a train of thought, arising from "too much thinking". Physical symptoms can manifest as well.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun exhaustion that affects mental keenness
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