Unmanageable means too difficult or too large to control. An unmanageable workload, unmanageable hair, become unmanageable.
It is a judgement about capacity rather than effort, which is why saying a workload has become unmanageable is a statement rather than a complaint. Of hair it is affectionate and universal.
1adjectiveunmanageableToo difficult or too large to control.
“The garden became unmanageable after he broke his leg, and weeds grew everywhere.”
unmanageable is a quality.
From un- + manageable.
Etymology from Wiktionary, CC BY-SA