unspecifiable

/ˌʌnˈspɛsɪfaɪəbəl/
adjective
  1. Not able to be stated or described exactly.
    • She felt an unspecifiable sense of unease as she entered the old house.
    • His reasons for leaving were unspecifiable, even to himself.
    • The recipe called for an unspecifiable amount of spice, just to taste.
Antonyms
What does "unspecifiable" mean? | whatsthatwordmean | whatsthatwordmean