In promulgating your esoteric cogitations or articulating your superficial sentimentalities and amicable, philosophical or psychological observations, beware of platitudinous ponderosity. Let your conversational communications demonstrate a clarified conciseness, a compact comprehensibleness, no coalescent conglomerations of precious garrulity, jejune bafflement and asinine affectations. Let your extemporaneous verbal evaporations and expatriations have lucidity, intelligibility and veracious vivacity without radomontade or Thespian bombast. Sedulously avoid all polysyllabic profundity, pompous propensity, psittaceous vacuity, ventriloquial verbosity and vaniloquent vapidity. Shun double-entendres, obnoxious jocosity and pestiferous profanity, observable or apparent.
In other words, say what you mean and DON'T USE BIG WORDS!