adj .
preachy ; pompous ; excessively moralizing ; self-righteous 설교조의 ; 젠체하는 ; 지나칠 정도로 도덕적인 ; 독선적인

• The new headmistress made a sententious speech in whish she urged to the student body to follow her illustrious example.
  신임 여교장은 자신을 본받을 것을 강조하는 훈시를 했다.
• I can stand a boring lecture, but not a sententious one, especially when I know that the professor giving it has absolutely nothing to brag about.