adjective.
Free from pain; without pain or trouble.
adjective.
Not difficult; easy.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
not causing physical or psychological pain
adjective.
requiring little hard work or exertion
Word Usage
"It is also quite a handy trait to have because it makes starting up again quick and painless (well, mostly painlessÂ… the volcano is a bit sensitive after it erupts)."