na-adjective
Describes something visually or qualitatively impressive, well-made, imposing, elegant, or excellent. Common with buildings, appearance, physique, achievements, and finished work.
駅前に立派なホテルが建った。
An impressive hotel was built in front of the station.
彼
He has a fine physique.
na-adjective
admirable; praiseworthy; worthy
Used to praise a person's conduct, attitude, character, or achievement as worthy of respect.
最後まで責任を果たしたのは立派だ。
It is admirable that you fulfilled your responsibility to the end.
彼女は立派に子どもたちを育てた。
She did an admirable job of raising the children.
na-adjective
A more specific use meaning fully legitimate or valid, especially of rights, status, or claims. It is not the main everyday sense learners first meet.
休暇を取るのは労働者の立派な権利です。
Taking leave is a legitimate right of workers.
na-adjective
undeniable; indisputable; solid
Emphatic use meaning that something fully qualifies as such, often before nouns like 犯罪 or 証拠. With negative nouns it can sound like 'plain' or 'downright.'
人の財布を盗めば、それは立派な犯罪だ。
If you steal someone's wallet, that is plainly a crime.
この録音は立派な証拠になる。
This recording will serve as solid evidence.