Frightful (adjective) خوفناک، ہولناک

very unpleasant, serious, or shocking.
Example: “there’s been a most frightful accident”
Synonyms: horrible, gruesome, grisly, ghastly, hideous, grim, revolting, repulsive, disgusting
Antonyms: mild
Erudite (adjective) عالم، دانشمند

having or showing great knowledge or learning.
Example: “Ken could turn any conversation into an erudite discussion”
Synonyms: learned, scholarly, well educated, knowledgeable, well read, widely read, well versed
Antonyms: ignorant, ill-educated