1. In a composed and unconcerned manner
   - coolly, nervelessly 
2. In an unconcerned manner
   - casually

See also: nonchalant

• play therapy
• play tricks
• play truant
• play up
• play with fire
• Play-Doh
• playa
• playable
• playact
• playacting
• playactor
• playback
• playbill
• playbook
• playbox
• playboy
• playday
• playdough
• played
• played out
• player
• player piano
• playfellow
• sinus paranasales
• sinus rectus