1. The changes in her appearance were so subtle that they were almost imperceptible.
2. The sound of the distant music was barely imperceptible to my ears.
3. His movements were so quick and fluid that they seemed almost imperceptible.
4. The shift in temperature was so slight that it was almost imperceptible to the average person.
5. The scent of the flowers in the garden was imperceptible until you got closer.
6. The passage of time was imperceptible as I lost myself in the book.
7. The difference in taste between the two dishes was imperceptible to most people.
8. The shadow of the bird passing overhead was imperceptible to those not paying attention.
9. The changes in the landscape were imperceptible to those who didn't visit regularly.
10. The shift in his mood was imperceptible to most, but I could tell something was bothering him.