Deinflect Japanese words. Ruby 1.9 or higher required.

gem install japanese_deinflector or add japanese_deinflector to your Gemfile.

jd = JapaneseDeinflector.new
jd.deinflect("嬉しくありません")

This method returns an array of weighted possible deinflections. Weight is a float between 0 and 1, where a weight of 1 is highly likely to be the correct deinflection, and a weight of 0 is highly unlikely:

[
  {:weight=>0.75, :word=>"嬉しい", :reason=>"polite negative"},
  {:weight=>0.5, :word=>"嬉しくある", :reason=>"polite negative"},
  {:weight=>0.375, :word=>"嬉しくありる", :reason=>"polite negative"}
]

Input text should be UTF-8 encoded.