What could be a dictionary approved, synonymous alternative for 'intentful'?

In sentence:

“I was intentful on the completion of the work today.”

I’d thought of using the following sentence too:

“I was desirous about completing the work today.”

But, it doesn’t sound as appropriate to me, as it wasn’t merely a desire or a wish that was being harbored, but the thought was more toward the ambition. The more proper and correct term, intent, suggested by a commenter, does seem usable. But, it still feels lacking, as it’s too infested with intention to me. Like, it emphasizes more toward the intention?

Supplementary:
Desire vs Intentful — as I distinguish:
The former would be just a wish a person would hold, while Intentful may lean more toward sketching a methodology into achieving one’s goal.