酸っぱい（すっぱい、suっpai）
- sour

The Japanese word 酸っぱい (pronounced すっぱい, *su-ppai*) means "sour". It describes a taste sensation, similar to how we use "sour" in English. It refers to the tart or acidic flavor found in foods like lemons, vinegar, or yogurt. The word can also be used figuratively to describe something that is unpleasant or difficult.

⚫︎ レモンは酸っぱいです。 Translation: The lemon is sour. ⚫︎ このヨーグルトはちょっと酸っぱいですね。 Translation: This yogurt is a little sour, isn't it? ⚫︎ 酸っぱい顔をする Translation: To make a sour face (to look displeased).

You use 酸っぱい (*su-ppai*) to describe the taste of something. It is an adjective (い-adjective), so it changes form depending on the tense and context. For instance, to say something *was* sour, you would use 酸っぱかった (*suppakatta*). You can use it in various situations, like: ⚫︎ Describing the taste of food: "This fruit is [酸っぱい] (sour)." ⚫︎ Expressing an opinion about the taste of food: "I think it is [酸っぱい] (sour)." ⚫︎ Describing a facial expression.

The word is written in: ⚫︎ Hiragana: すっぱい ⚫︎ Kanji: 酸っぱい The kanji 酸 (san) means "acid" or "sour," and っぱい (*ppai*) is the adjectival ending. There are no variations in okurigana. It's always 酸っぱい.

There aren't many direct synonyms for "sour" in Japanese in terms of taste. Related words that could sometimes be used depending on context include: ⚫︎ すっぱい味 (*suppai aji*) - sour taste (more descriptive) ⚫︎ 酸味がある (*sanmi ga aru*) - to have a sour taste (literally "to have sourness")

The antonym (opposite) of 酸っぱい (*su-ppai*) is 甘い (*amai*), meaning "sweet."

梅干しは酸っぱいけれど、おいしいです。 ・Translation: Pickled plums are sour, but delicious. ・Explanation: This sentence describes the common Japanese food, umeboshi, highlighting its sour taste while also expressing that it's enjoyable.

彼女は酸っぱい顔をして、その提案に反対した。 ・Translation: She made a sour face and opposed that proposal. ・Explanation: This sentence shows the figurative use of 酸っぱい (su-ppai) to describe a displeased facial expression.

The word 酸っぱい (*su-ppai*) is derived from the kanji 酸 (san), meaning "acid" or "sour," and the adjectival ending. The original form is thought to be from Old Japanese.