Gerund used as an uncountable noun meaning the act of disregarding.
Her ignoring of the doctor's advice worsened her condition.
Её игнорирование советов врача ухудшило её состояние.
ignoringgerund / present participle Occasionally functions adjectivally to describe a state of showing disregard.
His ignoring attitude toward the rules annoyed the supervisor.
Его игнорирующее отношение к правилам раздражало начальника.