The state of feeling physically or mentally exhausted and lacking energy.
From Old English 'teoreadung' or 'tyre' (to tire, exhaust), with Germanic roots. The '-ness' suffix (from Old English) converts the adjective 'tired' into an abstract noun, a pattern used hundreds of times in English.
Tiredness is one of the few truly universal human experiences—every culture experiences it and most have their own word for it. Modern science shows chronic tiredness often signals deeper issues like depression or hormonal imbalance, making the simple word 'tiredness' sometimes hide serious medical problems that deserve attention.
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