taxing — wearingly burdensome: the day-to-day, taxing duties of a supervisor.
waxing — Also called beeswax. a solid, yellowish, nonglycerine substance allied to fats and oils, secreted by bees, plastic when warm and melting at about 145°F, variously employed in making candles, models, casts, ointments, etc., and used by bees in constructing their honeycomb.
Three-syllable rhymes
relaxing — to make less tense, rigid, or firm; make lax: to relax the muscles.