glavolomka

== Serbo-Croatian == === Etymology === glava (“head”) +‎ lom- (“to break”) +‎ -ka. === Pronunciation === IPA(key): /ɡlaʋǒlomka/ Hyphenation: gla‧vo‧lom‧ka === Noun === glavòlomka f (Cyrillic spelling главо̀ломка) a tough nut to crack, a stumper (a difficult puzzle or problem)