Tiredness is the state of needing rest. Overcome with tiredness, sheer tiredness, tiredness at the wheel.
It names the feeling rather than the cause, so tiredness can come from work, illness or bad sleep alike. Road safety campaigns use it because fatigue sounds too technical.
1nountirednessThe state of needing rest.
“Tiredness at the wheel causes more crashes than most people think.”
tiredness is a state.
Tired plus -ness, from Old English teorian, to fail or grow weary.
Middle English
tiredness
English, today
tiredness
From Middle English tiredness, terednesse, equivalent to tired + ness.
Etymology from Wiktionary, CC BY-SA