Adjective painful has 4 senses
  1. painful - causing physical or psychological pain; "worked with painful slowness"
    painless, pain-free, unpainful
  2. afflictive, painful, sore - causing misery or pain or distress; "it was a sore trial to him"; "the painful process of growing up"
    Antonym: pleasant (indirect, via unpleasant)
  3. atrocious, abominable, awful, dreadful, painful, terrible, unspeakable - exceptionally bad or displeasing; "atrocious taste"; "abominable workmanship"; "an awful voice"; "dreadful manners"; "a painful performance"; "terrible handwriting"; "an unspeakable odor came sweeping into the room"
    Antonym: good (indirect, via bad)
  4. irritating, painful - causing physical discomfort; "bites of black flies are more than irritating; they can be very painful"
    Antonyms: comfortable, comfy (indirect, via uncomfortable)