Keen; eager; motivated — having strong willingness or drive to actively engage in tasks (used as a na-adjective).
新入社員は意欲的に業務を覚えようとしている。
The new employee is eager to learn the job.
意欲的な学生には多くのチャンスが与えられることが多い。
Motivated students are often given many opportunities.
彼は意欲的に研究に取り組んでいる。
He is working on his research with strong motivation.