improvident - Dictionary definition and meaning for word improvident
Im (not) provident (providing). Not providing for the future; thriftless.
Once upon a time there was an old man who was such a penny pincher that he did not even want to invest in a PROVIDENT fund for the future of his family thus im-provident= the miser= thriftless.
improvident..since they are providing everything no need to save(thrift) it...thriftless
Im(not) Prudent(Careful and sensible; marked by soundÂ judgment) thus, not prudent is careless,not given careful consideration.