妄为

妄为	wàng wéi	to take rash action
妄	wàng	absurd / fantastic / presumptuous / rash
为	wéi	as (in the capacity of) / to take sth as / to act as / to serve as / to behave as / to become / to be / to do / by (in the passive voice)
为	wèi	because of / for / to
为	wéi	variant of 为
为	wèi	variant of 为