Gerund functioning as an uncountable noun meaning the act or instance of confusing.
flummoxinggerund / present participle Functions as a present-participle adjective derived from the verb “flummox”.
The flummoxing puzzle took hours to solve.
Запутывающая головоломка заняла часы на решение.
The flummoxing instructions left everyone confused.
Сбивающие с толку инструкции оставили всех в замешательстве.