adjective
ambitious
am-BISH-us/æmˈbɪʃəs/
Having or showing a strong aim to achieve something difficult.
The ambitious jumper raises the bar for a harder challenge.

Etymology
Ambitio referred to going around to solicit votes, and the adjective described someone eager for office or favor. The selected meaning extends that eagerness beyond public standing to success and difficult goals generally.
In context
That I want to achieve X and Y goals, and I know this is what will enable it.” Arguments like that show that you are ambitious
More examples
- They proposed an ambitious restoration project.
- Her goals became more ambitious each year.
- The team is ambitious but realistic about the deadline.
Forms
ambitious
ambition noun — a strong desire to achieve
ambitiously adverb — with difficult or far-reaching aims