Crazy is őrült. Hülye is stupid, silly. For example, 'Ministry of Silly Walks' is 'Hülye járások minisztériuma'. https://www.youtube.com/watch?v=KAYYs-niFVA
Historically, hülye, idióta, retardált meant intellectually disabled as a medical term but it is not used nowadays becuase it became an insult (just like in English:idiot, moron)
I'm so hülyé that I misspelled "hülyék" as "hujék".
(In my defence, knowing when to write "ly" or "j" can be quite tricky. Sounding out the word in question is of no help in getting the spelling right in this case.)
"Hulye (stupid) is rude and hurtful. Silly ("buta") is less offensive and more playful. So - in Hungarian, as in English, it is incorrect to equate the words, "silly" and "stupid".
Silly is less offensive like stupid and I would translate it to "bolond / bolondos"