Senses
材大难用/ 材大難用 useless due to size
Literally referring to a tree with a trunk so swollen or branches so gnarled that it does not fit standard tools (from 庄子 )
材大难用/ 材大難用 great talent is hard to employ
Metaphorically used to describe a person with great talent who cannot find a suitable position or whose abilities are underutilized