bù​qīng

unclear

不清 bù​qīng
unclear adjective
unclear; blurred; vague
to be unable to finish particle
(after a verb) unable to finish or settle a matter clearly or satisfactorily

I really don't remember.

muddy
(literary) muddy; turbid; not pure
endlessly
(used after a verb or adverbial phrase) endlessly; without stop; incessantly