Естественно, я хочу отдохнуть вечером.

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Breakdown of Естественно, я хочу отдохнуть вечером.

• хотеть: to want
• вечером: in the evening
• отдохнуть: to rest

Questions & Answers about Естественно, я хочу отдохнуть вечером.

What exactly does Естественно mean here? Is it closer to “naturally” or “of course”, and is it an adverb or something else?

Естественно literally comes from естественный (natural), so its core meaning is “naturally”.

In this sentence, though, it functions more like an introductory word (parenthetical), very similar to “of course”, “naturally”, or “obviously” in English:

• Естественно, я хочу отдохнуть вечером.
  → Naturally / Of course, I want to rest in the evening.

Grammatically, естественно is an adverb, but in this position (set off by a comma at the start of the sentence) it behaves as a sentence adverb or discourse marker, commenting on the whole statement.

Why is there a comma after Естественно?