1. Not easily perturbed or excited or upset; marked by extreme calm and composure
   "hitherto imperturbable, he now showed signs of alarm"; "an imperturbable self-possession"
   - unflappable

See also: composed, imperturbableness

• successfully
• successfulness
• succession
• successional
• successive
• successively
• successiveness
• successor
• succinate
• succinct
• succinctly
• succinctness
• succinic
• succinic acid
• succinylcholine
• succor
• succorer
• succory
• Succos
• succotash
• Succoth
• succour
• succourer
• succuba
• succubus