wàng xiǎng
to attempt vainly
a vain attempt
delusion
chī xīn wàng xiǎng
to labor under a delusion (idiom); wishful thinking
trad. form 痴心妄想 also used
wàng xiǎng zhèng
delusional disorder
(fig.) paranoia
chī xīn wàng xiǎng
to be carried away by one's wishful thinking (idiom)
to labor under a delusion
wishful thinking