Cases of word usage

1) the ability to understand quickly and clearly (acumen)

2) (an example of) natural or acquired ability (aptitude)

3) the creation or expression of what is beautiful, especially in visual form; great skill or ability in such expression (art)

4) having mental or physical ability (capable)

5) the natural ability to create enthusiasm and liking for oneself (charisma)

6) a person who claims to have more skill, knowledge or ability then he or she really has (charlatan)

7) too confident or sure of one's ability etc (cocky)

8) pleased with oneself or one's ability (and not caring about others) (complacent)

9) (showing) ability to deceive easily (cunning)

10) requiring much effort, strength, skill or ability (difficult)