keenness Get Printable Handwriting (keen-ness) 2 syllables Learn It! Spelling Test Definition noun. 1 a quick and penetrating intelligence 2 a positive feeling of wanting to push ahead with something Example Sentence Her keenness for life was contagious. Synonyms acuteness; acuity; sharpness; eagerness; avidity Antonyms ignorance; apathy Share with your friends: