The simple instruction tighten nut, in an assembly guide for a mechanical implement, is unhelpful and potentially damaging if the nut in question must be tightened by turning it counter-clockwise. Vague and inaccurate language appears often enough in scientific and technical writing, but it's hard to get away with. In the fine arts, social sciences, and humanities, it's easier to get away with but equally useless. Democracy in political science, culture in anthropology, normal in psychology, society in sociology, knowledge in philosophy, structure in literature and the arts are all terms that have little or no meaning unless accompanied by further qualification and explanation. When in doubt, check the dictionary.
Language has a shelf life.
You're not a machine, but you're not David Letterman. In most situations it's appropriate and desirable for the writer to project a human presence. By choosing words carefully and using fresh language you will automatically put an individual stamp on your prose. A little levity can also give your writing a human touch. Just go lightly and don't overrate your wit.