painless

[peyn-lis]
adjective
1.
without pain; causing little or no pain: painless dentistry; a painless cure.
2.
Informal. not difficult; requiring little or no hard work or exertion.

Origin:
1560–70; pain + -less

painlessly, adverb
painlessness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
painless
 
adj
1.  not causing pain or distress
2.  not affected by pain
 
painlessly
 
adv
 
painlessness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In the first, the arch returns when standing on one's toes and is typically
  painless and symptom-free, requiring no treatment.
The operation is nearly bloodless and, since brain tissue does not register
  sensation, almost painless as well.
The illusion of painless cost control confronts another serious problem.
The injection was painless, afterwards had to use meds for several days with
  ice.
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