àdììtú noun /à.dìì.tú/
Definitions
  1. mystery
  2. secret
Etymology
From à- (“nominalizing prefix”) + dì (“to bind”) + ì (“negative prefix”) + tú (“to unravel”), literally “That which is bound and cannot be unraveled”.
Component words
à-nominalizing prefixto bindìnegative prefixto unravel
Used in
àdììtú ọlọ́rọ̀
Source: Wiktionary, where this word is spelled “adiitu”. Reference: en-adiitu-yo-noun-Tw2eXy0V