1、The chef's thin lips curved with a hint of unnoticeable smile.

2、It's like sprinkling drops of our efforts into the ocean - the overall effect is so little as to be unnoticeable.

3、She didn't think about winning the prize. She thought it was a long way off because her performance had been unnoticeable.

4、So-called “Table with splashes” covers with water a nosy visitor bending over the table the edges of which are equipped with unnoticeable sprayers.

5、It's like an agile athlete balancing on one foot: They constantly adjust and realign themselves, but these adjustments are virtually unnoticeable in the context of the performance.

6、In the family, it is probably built on the edge of the unnoticeable place, the foundation is half a foot lower than the main house, the roof is mostly platform.

7、Which is another way of saying that its effect is virtually unnoticeable - low down in the revs there's not much torque, but equally up high there's not an abundance of poke.