The Greek adjective dysermeneutos means hard to explain or difficult to interpret — used in Hebrews to describe the challenge of communicating deep theological truths to immature believers.
Dysermeneutos appears in Hebrews 5:11, where the author wants to explain the high priestly order of Melchizedek but acknowledges: 'We have much to say about this, but it is hard to make it clear to you because you no longer try to understand.' The problem is not that the truth is inherently incomprehensible — it is that spiritual immaturity and lack of engagement make deep things inaccessible. This word is a call to spiritual growth, continued study, and the discipline required to move from milk to solid food. God's word is inexhaustible; the limitation is always on the receiver's side.