Wiktionary
distractibility
n. The ease with which a person's concentration can be interfered with by external stimulation or by irrelevant thoughts
Usage examples of "distractibility".
Foryth Teel, for all of his distractibility, at least did not seem likely to be any threat.
I saw past her giddiness and distractibility, into a soul capable of more pain and vaster regret than I had ever suspected.