It would have to be "studuisti" instead of "studisti". Although the translation "Why did you not study enough?" is tempting, in classical usage, the verb "studere" meant "to desire, to be eager for, to busy oneself with or to strive", so a more faithful translation - bearing in mind that you do not provide a context and you have not told us which period it comes from - would be "Why did you not try hard enough?"

lovely that an italian don't recognise latin....amazing. "why didn't you study it all?" free translation, probably not totally correct. "satis" means: enough, sufficiently. i understood the phrase except this word. but i don't know latin, so don't expect me to help every time.

i've never loved latin,bad school memories! however i thought it was latin but this is the italian section so i thought it could be some dialect form(you know,a lot of dialect words have something in common with latin because they come from vulgar latin; an example is "studiasti" that is calabrese dialect and it seems latin!) bye!

are you sure this is italian? i'm italian and for me it doesn't make any sense...maybe it's dialect... where have you heard it? ciao!