I think sice zły can be used both for "bad" and for "evil", shouldn't "this bread is evil", although weird-sounding, correct?
What is the exact pronunciation of "zły"? Is it more like 'zuye' or 'zue'? Robot sounds like the latter.
z is pronounced as in English. ł is pronounced like w in English. y is a vowel sound more or less similar to the e in roses.