indiscernible difference
barely indiscernible
virtually indiscernible
practically indiscernible
A: Can you tell the difference between these two samples?
A：你能分辨出这两个样本之间的区别吗？
B: To be honest, the difference is indiscernible.
B：坦白说，区别简直无法辨认。
1) 无法辨认的
2) 难以察觉的
3) 看不清楚的
1. 无法辨认的，察觉不到的
adjective
1. Impossible to see, hear, or notice.
Synonym: imperceptible, undetectable