Synonyms for Illegal indulgence:

• n.

  •forbidden fruit (noun)
  • prohibition,
  • taboo.

• Other synonyms:

  •n.
  • forbidden fruit,
  • prohibitions,
  • no-no,
  • illicit love,
  • no-no's,
  • no-nos,
  • desired object,
  • forbidden indulgence,
  • golden apple,
  • illegal pleasure,
  • immoral pleasure,
  • prohibited article.