adverb (r)

• and nothing more(adv.all)

  Example:
  It is simply a matter of time.
  

  Synonym:
  but, just, merely, only
  

  source: wordnet30
• absolutely(adv.all)

  Example:
  It's simply beautiful!.
  

  Synonym:
  just
  

  source: wordnet30
• absolutely; altogether; really(adv.all)

  Example:
  We are simply broke.
  

  source: wordnet30
• in a simple manner; without extravagance or embellishment(adv.all)

  Example:
  They lived very simply.
  

  source: wordnet30
• In a simple manner or state; considered in or by itself; without addition; along; merely; solely; barely.(adverb)

  source: webster1913