1) Abstract nouns refer to ideas, qualities and conditions that cannot be seen or touched.
2) Examples of abstract nouns include greed, unhappiness, fear, anger, delivery, embarrassment, intelligence, beauty, courage, victory, activity, conclusion, imagination, appointment, happiness, friendship, disturbance, beginning, removal, ability, clumsiness, invasion, and pride.
3) Abstract nouns identified in sentences include honesty, year, hunger, thirst, days, and weeks.