acrimonious to perfunctory Caustic; bitter or sharp or angry in tone; rude Political debates can become rather acrimonious. To make better; to relieve; to improve It is difficult to come up with a solution that will ameliorate the crashing housing market. Open or willing to advice or suggestion Your mother might be amenable to raising your allowance if you do more chores in the house. Shapeless; having no definite form The tree trunk was practically amorphous after years of exposure to the elements. Capable of floating; cheerful Her buoyant personality was refreshing at the somber ceremony; we all needed a lift. To persuade with deliberate flattery, to coax, to wheedle The boy cajoled his mom into buying him candy at the grocery store. A serious event causing distress or misfortune The poor Haitians have experienced one calamity after another. To reduce in dignity or quality Do not debase yourself by using such foul language. To erase; to wear away After years of wear, the veneer on the table had effaced. To make clear as to be understood I will try to elucidate the changes in the tax code for you. Lasting a short period of time; fleeting Their relationship was only an ephemeral one; by the time she graduated, it was over. Savagery We were surprised at the ferocity of the summer thunderstorm. To thrive; to grow well Her career in medicine flourished after the stint she served in the Peace Corps. Arrogant; excessively proud or vain A few of the varsity players acted haughtily toward the freshmen, and the coach castigated them for their pomposity. Incapable of being penetrated; not capable of being damaged Because this watch is impervious to water, I can wear it when I swim. Lacking significance, meaning; insipid We tired of their inane conversation about reality television stars. Laziness After watching her son spend countless hours playing videogames, the mother reproved her son for his indolence. Incapable of error The makeup is advertised to have infallible blemish coverage. Difficult to understand; mysterious The Mona Lisa is known for her inscrutable smile; many have pondered what she was feeling at that portrait sitting. Slow; sluggish; listless; weak The old man took languid steps as he plodded along the hospital hallways. Desire to harm others; spite She claimed she killed him accidentally, but the investigators proved she acted out of malice. Slanting; indirect; misleading; evasive He made oblique references to his Ivy League background, when in fact he had not graduated from college. Wealth; affluence; abundance The tourists enjoyed viewing the opulence of Windsor Castle . Showing or feeling regret for wrongdoing; repentant He was penitent for having taken so much money from his elderly grandmother and wasting it on alcohol. Acting routinely with little interest or care Due to his perfunctory manner in inspecting the restaurant, he did not notice the real problem.