ascetic

abjure
       (v.) to reject, renounce (To prove his honesty, the president abjured the evil policies of his 
      wicked predecessor.)

abrogate
       (v.) to abolish, usually by authority (The Bill of Rights assures that the government cannot 
      abrogate our right to a free press.)

acerbic
       (adj.) biting, bitter in tone or taste (Jill became extremely acerbic and began to cruelly make 
      fun of all her friends.)

acrimony
       (n.) bitterness, discord (Though they vowed that no girl would ever come between them, Biff 
      and Trevor could not keep acrimony from overwhelming their friendship after they both fell 
      in love with the lovely Teresa.)

acumen
       (n.) keen insight (Because of his mathematical acumen, Larry was able to figure out in 
      minutes problems that took other students hours.)

adumbrate
       (v.) to sketch out in a vague way (The coach adumbrated a game plan, but none of the players 
      knew precisely what to do.)
alacrity
       (n.) eagerness, speed (For some reason, Chuck loved to help his mother whenever he could, 
      so when his mother asked him to set the table, he did so with alacrity.)

anathema
       (n.) a cursed, detested person (I never want to see that murderer. He is an anathema to me.)

antipathy
       (n.) a strong dislike, repugnance (I know you love me, but because you are a liar and a thief, I 
      feel nothing but antipathy for you.)

approbation
       (n.) praise (The crowd welcomed the heroes with approbation.)

arrogate
       (v.) to take without justification (The king arrogated the right to order executions to himself 
      exclusively.)

ascetic
       (adj.) practicing restraint as a means of self-discipline, usually religious (The priest lives an 
      ascetic life devoid of television, savory foods, and other pleasures.)