noun which may take the genitive case particle 'no', taru-adjective, adverb taking the 'to' particle
full of zeal; highly motivated; very eager
Describes a person or attitude brimming with enthusiasm and drive. Often used in formal or written contexts to emphasize strong motivation.
彼は新しいプロジェクトに意欲満々だ。
He is full of enthusiasm for the new project.
意欲満々の新人が入社した。
A highly motivated new employee joined the company.
彼女は意欲満々と研究に取り組んでいる。
She is tackling her research with great eagerness.
Compound of 意欲 (いよく, 'will, desire, motivation') and 満々 (まんまん, 'full of, brimming with'). The second element is a reduplicative suffix expressing abundance.