Sentence:  Powerful feelings and generous designs are, alas! too like the inheritance of a miser in the hands of some <WSD>spendthrift</WSD> heir—lavished away on trifles in our early years, and needed, but not posessed, in our riper age. 
Meaning of the word marked with <WSD> tags:  Improvident, profligate, or wasteful. (from late 16th c.)