Don't worry with すんな

Grammar Explanation: Contracting 〜る＋な to 〜んな

Takeo takes his pregnant mother to the hospital, as she’s getting close to delivery. Once there, she gives Takeo and his friend Suna a list of things to take care of during her stay.

母(かあ)さん:: 「大丈夫(だいじょうぶ)から心配(しんぱい)すんな」; “I'll be fine, so don't worry.”

Key Points

1すんな = contraction of するな (“don’t do”)

すんな is a casual spoken contraction of するな (the prohibitive form: “don’t do X”).
The full form here would be: 心配(しんぱい)するな “Don’t worry”
Pattern: 〜る＋な becomes 〜んな (drop る, add んな)

2Why this contraction sounds casual

The prohibitive な itself is already informal/casual (more direct than ないで).
The contraction 〜んな makes it even more colloquial and abrupt.
This is common in everyday speech, especially among family or close friends.

3心配(しんぱい)する = “to worry”

心配(しんぱい) means “worry” or “concern” (noun).
心配(しんぱい)する turns it into a verb: “to worry”.
Other examples: 勉強(べんきょう)する (“to study”), 準備(じゅんび)する (“to prepare”).

4から adds reasoning

大丈夫(だいじょうぶ)だから = “because I’ll be fine”
The から connects the reason to the command that follows
“I’ll be fine, so (therefore) don’t worry.”

Don't worry with すんな

Key Points

See Also