1. in a way that cannot be reached, entered, or approached
2. in a way that is difficult to understand or comprehend

Examples

• The mountain peak was inaccessibly high for most climbers.
• The ancient ruins were located inaccessibly deep in the jungle.
• The professor explained the theory so inaccessibly that no one understood.
• The research data was stored inaccessibly in encrypted files.
• The castle was built inaccessibly on a cliff face.
• Her writing style was inaccessibly complex for young readers.