Ruby block `block in Method': undefined method `inject' for true:TrueClass (NoMethodError)

I have a method that takes in a string and returns a new sentence string where every word longer than 4 characters has all vowels removed. The output should return a modified sentence string to these specs.

def abbreviate_sentence(sent)
  arr = []
  word = sent.split("")
  word.reject do |v|
       if word.length > 4
         arr << %w(a e i o u).any?.inject(v)
       else arr << word
       end
  end
  return arr
end

I get the following error and am trying to include/"inject" the modified elements into a new array in which to join into the desired string described above. If I remove "inject" I get a boolean and not the modified string.