1. splendid; fine; handsome; elegant; imposing; prominent; impressive
ああ、立派な物だな。Ah, what a splendid thing.
2. praiseworthy; creditable; worthy
お金にはならなくても、それだって立派な仕事なんだから。Even if it doesn't make money, it is still a respectable job.
3. legal; legitimate; lawful
4. undeniable (e.g. crime); indisputable; solid
立派な証拠でしょ？That is solid evidence, isn't it?