Formal and informal greetings sound completely different
Unlike languages that shift formality with just a pronoun, Czech uses genuinely different words: "Dobrý den" and "Na shledanou" for formal situations, versus the all-purpose "Ahoj" among friends and peers. Using the formal set as a default is the safer choice with anyone you don't already know.
Czech spelling includes marks not found in English
Letters like ř, ě, and the háček accent mark (ˇ) change pronunciation significantly and appear throughout everyday Czech; "ř" in particular, found in names like Dvořák, is widely considered one of the hardest single sounds for non-native speakers to master.
Frequently Asked Questions
Is Ahoj really used for both hello and goodbye?
Yes — much like "aloha" in Hawaiian, it works in both directions among people who already know each other, though it is too informal for shops, offices, or anyone you've just met.
Is Czech similar to Russian?
Both are Slavic languages and share some vocabulary roots, but they are not mutually intelligible in practice, and Czech uses the Latin alphabet rather than Cyrillic.