1. Not methodically or according to plan
   "he dealt with his course work casually" 
2. In an unconcerned manner
   "glanced casually at the headlines"
   - nonchalantly

See also: casual

• suspicion
• suspicious
• suspiciously
• suspiciousness
• suspiration
• suspire
• Susquehanna
• Susquehanna River
• suss
• suss out
• Sussex
• Sussex spaniel
• Sussex University
• sustain
• sustainability
• sustainable
• sustained
• sustained yield
• sustainer
• sustaining pedal
• sustaining program
• sustainment
• sustenance
• sustentacular
• sustentation