Sentence:  The simplest tool I can think of is a piece of gravel used for making a road. Nothing is done to it, it owes its being a tool to the fact that is subserves a purpose. A broken piece of granite used for macadamizing a road is a more complex instrument, about the <WSD>toolishness</WSD> of which no doubt can be entertained. 
Meaning of the word marked with <WSD> tags:  The nature of being a tool.