1. not revealed, uncovered, or made visible
2. not subjected to or affected by something harmful or unpleasant
3. not having experience with or knowledge of something

Examples

• The unexposed film was carefully stored in a dark container.
• Children in rural areas often remain unexposed to urban pollution.
• The unexposed foundation was protected by waterproof coating.
• She was unexposed to classical music until college.
• The unexposed wire posed a safety hazard.
• Many students are unexposed to advanced mathematics concepts.
• The photographer kept the unexposed negatives in a cool, dry place.