prudence; discipline; self-control
Almost always used in the negative form だらしがない or the adjective だらしない, meaning 'slovenly', 'lacking self-discipline', or 'careless'. The positive form だらし is rare and mostly appears in fixed expressions like だらしをつける.
See also: だらしない
He showed some discipline and finally quit smoking.
He lacks discipline, so his room is always messy.
Get your act together and live with more self-control.
The origin is uncertain. It may be related to the mimetic word だらだら (sluggish, dripping) or the verb だれる (to become slack), but the exact derivation is unclear.