1. in a way that is so gradual as to be imperceptible
2. without awareness or consciousness
Usage: formal

Examples

• The seasons changed insensibly from summer to fall.
• She had insensibly grown accustomed to the city noise.
• The patient slipped insensibly into unconsciousness.
• His hair had turned gray so insensibly that no one noticed.
• The conversation drifted insensibly to more serious topics.
• He found himself insensibly drawn to her quiet confidence.