barely there; almost nonexistent
Describes something so faint, small, or subtle that it is practically absent. Often used with nouns like 差 (difference), 可能性 (possibility), or 程度 (degree).
There is only a barely perceptible difference between the two.
The chance of success is almost nonexistent.
A set phrase combining ある (to exist) and ない (not exist) with the particle か (or), literally 'whether it exists or not', used idiomatically to mean 'barely there'.