Tunisian is the word for anything or anyone belonging to Tunisia. It works two ways.

Tunisian Tunisian is the word for anything or anyone belonging to Tunisia是用來指屬於Tunisia（突尼西亞）的人事物的字。It works two ways它有兩種用法。

As a describing word, it goes in front of a noun: Tunisian food, the Tunisian government, a Tunisian passport.

As a describing word當形容詞用時，it goes in front of a noun它放在名詞前面：Tunisian food（突尼西亞菜）、the Tunisian government（突尼西亞政府）、a Tunisian passport（突尼西亞護照）。

As a noun, it means a person from Tunisia — 'he is a Tunisian', 'two Tunisians won medals'.

As a noun當名詞用時，it means a person from Tunisia指來自Tunisia的人——'he is a Tunisian'他是Tunisian（突尼西亞人）、'two Tunisians won medals'兩個Tunisians得了獎牌。

Both need a capital letter, always, because it comes from a country name; that rule holds for every word of this kind in English (Japanese, Brazilian, Taiwanese).

Both need a capital letter, always兩種用法永遠都要大寫，because it comes from a country name因為它是從國名來的；that rule holds for every word of this kind in English這個規則適用於英語裡所有這類字（Japanese、Brazilian、Taiwanese都一樣）。

The two uses feel a little different in tone. English speakers usually prefer the adjective with 'be': 'she is Tunisian' sounds more natural in ordinary talk than 'she is a Tunisian', which can sound like you are putting the person in a category. Safer habit: use it as an adjective with people, and keep the noun for lists and counting.

The two uses feel a little different in tone這兩種用法的語感有點不同。English speakers usually prefer the adjective with 'be'英語母語者用'be'時通常比較喜歡用形容詞：'she is Tunisian'（她是突尼西亞人）sounds more natural in ordinary talk than 'she is a Tunisian'在日常對話裡聽起來比'she is a Tunisian'自然，which can sound like you are putting the person in a category後者聽起來比較像在把人歸類。Safer habit比較保險的作法：use it as an adjective with people跟人有關時當形容詞用，and keep the noun for lists and counting名詞用法留給列表和計數的時候。

Note also that it says nothing about language — there is no 'Tunisian' language; people there speak Arabic and French.

Note also that it says nothing about language另外要注意這個字跟語言無關——there is no 'Tunisian' language沒有「Tunisian」這種語言；people there speak Arabic and French當地人講的是阿拉伯語和法語。