1. in an eager, enthusiastic, or intense manner
2. in a sharp, perceptive, or acute manner
3. deeply or strongly (of feelings or awareness)

Examples

• She listened keenly to every word of the lecture.
• The detective observed the suspect keenly for any signs of deception.
• He was keenly aware of the risks involved in the project.
• The students were keenly interested in the science experiment.
• She felt the loss keenly and mourned for months.
• The coach watched keenly as the players practiced their moves.
• He keenly anticipated the results of his job interview.