How to describe the seemingly absent fragrance?

Please refer to the following

1. There is a faint fragrance in the room, like twinkling stars in the sky.

2. A faint fragrance wafts in, as if there is nothing!

3. When the taste is not strong, there is a faint fragrance, which can be described as "dark fragrance with sleeves" and "elegant fragrance", because both "dark fragrance" and "fragrance" belong to a light but not strong fragrance, and it will not come to the nose without careful smell. These are common descriptions of delicate fragrance. If the fragrance is elegant and fresh, it can also be used. "

Its fragrance seems to be absent, intermittent and lingering.