Polish

Slavic languages systematically lost short vowels (jers) about a thousand years ago, leaving behind clusters of consonants that used to be separated by vowels. Words like 'wstrząs' (shock), 'źdźbło' (blade of grass), or 'bezwzględny' (ruthless) have plenty of them. The clusters look terrifying but follow regular phonotactic patterns and are pronounceable once you stop expecting English-style vowel scaffolding.

Nominative (subject), genitive (possession, negation), dative (indirect object), accusative (direct object), instrumental (means), locative (location, after certain prepositions), and vocative (addressing someone directly). Every noun, adjective, and pronoun changes ending depending on case, number, and gender. The case system is the steepest part of Polish grammar but also what gives the language its flexible word order.

Both are Slavic but in different branches — Polish is West Slavic, Russian is East Slavic. They share grammatical structure, vocabulary cognates, and the perfective–imperfective aspect system, but they're not mutually intelligible. Polish uses the Latin alphabet; Russian uses Cyrillic. A Polish speaker has a head start on Russian compared to a non-Slavic speaker, but real understanding requires study.

Yes — three (masculine, feminine, neuter) plus a further split of masculine into masculine personal vs masculine non-personal in the plural. This 'virile' vs 'non-virile' distinction means Polish has effectively four-way agreement in the plural: men get one form, women and inanimate objects get another. Verbs in past tense agree with gender, as do adjectives and pronouns.

Among Slavic languages, often considered one of the more challenging because of its case complexity, gender system, and consonant clusters. The Latin alphabet helps. The biggest hurdles are the seven-case noun system, the verb aspect distinction (every verb in two flavours), and the personal vs non-personal masculine plural. Most learners describe a long but rewarding curve.