casualness

adjective

1. happening by chance; not planned; incidental: a casual visit
2. happening, active, etc. at irregular intervals; occasional: a casual worker
3. slight or superficial: a casual acquaintance
4. 1. careless or cursory: far too casual in his methods
   2. nonchalant; dispassionate: affecting casual unconcern
5. 1. informal or relaxed: a casual atmosphere
   2. designed for informal occasions or use: casual clothes

noun

1. one who does something only occasionally or temporarily, esp. a casual worker
2. shoes, clothes, etc. designed for informal occasions
3. Mil. a person temporarily attached to a unit, awaiting a permanent assignment or transportation