1. impossible or very difficult to teach or instruct
2. unwilling to learn or accept instruction

Examples

• The student seemed unteachable, refusing to listen to any guidance.
• Some habits are so ingrained they appear unteachable.
• The coach found the player’s bad technique almost unteachable.
• Her unteachable attitude frustrated all her instructors.
• The concept proved unteachable to students at that level.
• He had an unteachable spirit that resisted all correction.