unlearnable

/ʌnˈlɜrnəbəl/
adjective
  1. Impossible or very difficult to forget or discard after being learned.
    • Some childhood fears are almost unlearnable, even with therapy.
    • The song's melody was so catchy it seemed unlearnable.
    • For many, riding a bike is an unlearnable skill once mastered.
What does "unlearnable" mean? | whatsthatwordmean | whatsthatwordmean