frugal adj.节俭的(thrifty economical)
economize 节俭(save, cut costs)
When they bought a house, the family had to economize to pay their mortgage
economical 节约的 经济的（thrifty）
Purchasing clothing that will only be worn once is not very economical
canny adj.精明的 节俭的(shrewd cunning)
stocially adj.淡泊地(impassively)
austerity n.节俭
Austerity is the chosen lifestyle of a monk
thrift n.节俭(economy frugality)