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For years I've had most of the disadvantages of being a government employee - - price control , red tape , impenetrable bureaucracies to deal with - - with few or none of the advantages . The self-will depicted in those small projecting teeth and that small receding chin was of a more dismaying kind than that which a powerful jaw betokens ; it was a self - - will imperturbable , impenetrable , unintelligent ; a self-will dangerously akin to obstinacy . They often just hunker down and spread across the hard , impenetrable surface of rocks . From the living timber of stark , impenetrable nature comes the raw wood of human cruelty and the burning seats of our religious hopes . Like many invasive plants , yellow star-thistle develops into dense , impenetrable stands that displace native vegetation in natural areas and in rangeland by out-competing it for sunlight , soil moisture and nutrients .