The best replacement for lonely is alone.

The best alternatives to lonely are rated as following:
★★★★★  alone
★★★★  lonesome
★★★  depressed
★★  in love
★  bored
★  solitude
★  lonely
★  love
★  alone difference
★  just alone
★  solitary
★  miss my ex
★  needy
  being alone
  married and miserable
  feeling alone
  married and bored
  do i miss him
  sad

Your alternative for lonely is not listed? Suggest!
Speaking about lonely, one probably shouldn't forget about akon.

Other search terms related to lonely and their ratings are:
★★★★★ akon
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lonely
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