Definition of unriddleable in English:

unriddleable

adjective

(also unriddlable)
  • Of a mystery, etc.: unsolvable.

Pronunciation

unriddleable

/(ˌ)ʌnˈrɪd(ə)ləbl/ /(ˌ)ʌnˈrɪdləbl/

Origin

Mid 17th century; earliest use found in John Evelyn (1620–1706), diarist and writer. From un- + riddle + -able.