squeaky

squeaky
squeak‧y /ˈskwiːki/ adjective
1. making very high noises that are not loud:
    a squeaky voice
    squeaky floorboards
2. squeaky clean informal
  a. never having done anything morally wrong:
    politicians who are less than squeaky clean
  b. completely clean:
    squeaky clean hair
—squeakily adverb
—squeakiness noun [uncountable]
     

THESAURUS

■ sounds
   ▪ high-pitched higher than most sounds or voices: He has a rather high-pitched voice. | Bats make high-pitched squeaks. | the high-pitched whine of a dentist's drill
   ▪ shrill high and unpleasant: Her voice became more shrill. | The bird has rather a shrill cry.
   ▪ piercing extremely high and loud, in a way that is unpleasant: a piercing scream | Suddenly I heard a piercing whistle.
   ▪ squeaky making very high noises that are not loud: a squeaky gate | squeaky floorboards | a squeaky little voice