ambitious

adj. aspiring, desirous of success ; requiring great effort

Motivation is a reason or set of reasons for engaging in a particular behavior, especially human behavior as studied in psychology and neuropsychology. The reasons may include basic needs (e.g., food, water, shelter) or an object, goal, state of being, or ideal that is desirable, which may or may not be viewed as "positive," such as seeking a state of being in which pain is absent. The motivation for a behavior may also be attributed to less-apparent reasons such as altruism or morality.
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Adjective
1. having a strong desire for success or achievement
(antonym) unambitious, ambitionless
(similar) aggressive, enterprising, pushful, pushing, pushy
(see-also) enterprising
(attribute) ambition, ambitiousness
2. requiring full use of your abilities or resources; "ambitious schedule"; "performed the most challenging task without a mistake"
(synonym) challenging
(similar) difficult, hard

(a.)
Strongly desirous; -- followed by of or the infinitive; as, ambitious to be or to do something.
  

(a.)
Springing from, characterized by, or indicating, ambition; showy; aspiring; as, an ambitious style.
  

(a.)
Possessing, or controlled by, ambition; greatly or inordinately desirous of power, honor, office, superiority, or distinction.
  

lang2 zi3 ye3 xin1
A wolf cub with a savage heart.
To have a wolfish nature. To be full of wild ambitions.