Ten dwujęzyczny słownik jest bardzo przydatny.

From Lesson 446:Compound adjectives·Polish

Breakdown of Ten dwujęzyczny słownik jest bardzo przydatny.

być
to be
ten
this (m)
bardzo
very
słownik
dictionary
przydatny
useful
dwujęzyczny
bilingual

Questions & Answers about Ten dwujęzyczny słownik jest bardzo przydatny.

How exactly is the compound adjective dwujęzyczny built from its root words?
It combines the numeral dwa (two) and the noun język (language). When numbers form the first part of a compound adjective, they typically use the connecting vowel -u-, creating the prefix dwu-. The noun part then takes a standard adjective suffix like -ny.
Why is dwujęzyczny written as one solid word instead of being hyphenated?
In Polish orthography, compound adjectives are written as one unbroken word if the two parts have a modifying relationship (meaning one part depends on the other, like having two languages). You only use a hyphen when the two parts are equal and independent, such as polsko-angielski (Polish-English).
If we were talking about multiple dictionaries, how would the ending of dwujęzyczny change?
Because słownik is a masculine inanimate noun, its plural is słowniki. The adjective would take the non-masculine-personal plural ending -e, giving us te dwujęzyczne słowniki. If the noun were masculine personal, the compound adjective would require a consonant mutation and take the ending -i or -y.
Could I use użyteczny instead of przydatny here since they both translate to useful?
Yes, but przydatny is much more natural here. It specifically means something comes in handy or is helpful for a particular task, like a dictionary. The word użyteczny is slightly more formal and usually describes broader, objective utility, like a public service or a new invention.

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