杞人之忧

man of Qǐ fears the sky falling (idiom); groundless fears

Qi, a Zhou Dynasty vassal state / surname Qi

Chinese wolfberry shrub (Lycium chinense) / willow

person; people / CL:個|个[ge4],位[wei4]

(possessive particle, literary equivalent of 的[de5]) / him / her / it

to worry / to concern oneself with / worried / anxiety / sorrow / (literary) to observe mourning