全然〜ない

全然（ぜんぜん） is a versatile adverb used to express absolute negation. While often taught as strictly requiring a negative ending, in modern casual Japanese, it is frequently used with affirmative words to mean 'completely' or 'very,' or to contradict a negative expectation. Although sometimes viewed as modern slang, pairing 全然（ぜんぜん） with affirmatives is actually a return to its historical roots (such as in the Meiji era); the strict negative-only rule was a post-WWII educational prescription. However, for standard grammar and testing, it is primarily paired with a negative.

Usage Rules:

• With Verbs: Use the negative form or polite negative. These can also be in the past tense, such as plain past negative or polite past negative. (e.g., 全然食べない（ぜんぜんたべない） - don't eat at all, 全然食べなかった（ぜんぜんたべなかった） - didn't eat at all)
• With I-Adjectives: Use the negative form or past negative. (e.g., 全然面白くない（ぜんぜんおもしろくない） - not interesting at all, 全然面白くなかった（ぜんぜんおもしろくなかった） - wasn't interesting at all)
• With Na-Adjectives/Nouns: Use the negative form or past negative. (e.g., 全然暇じゃない（ぜんぜんひまじゃない） - not free at all)
• With Semantically Negative Words: Even in standard Japanese, 全然（ぜんぜん） is frequently paired with grammatically affirmative words that carry a negative or oppositional meaning, such as ダメ（だめ） (useless) and 違う（ちがう） (different/wrong). (e.g., 全然違う（ぜんぜんちがう） - completely different)

Nuances and Comparisons:

• Bracketing (Distance): 全然（ぜんぜん） and the negative ending act as a 'bracket' around the sentence. They can be separated by many words, so be careful to ensure the sentence ends in a negative even if it becomes long.
• Casual Affirmative Usage: Using 全然（ぜんぜん） with a positive adjective (like 全然美味しい（ぜんぜんおいしい）) means 'very' or implies that the result was better than a negative expectation. Additionally, phrases like 全然大丈夫（ぜんぜんだいじょうぶ） (completely fine) and 全然平気（ぜんぜんへいき） (totally unbothered) are very common in casual speech to contradict a negative expectation, though they are not considered standard Japanese. Note: You should explicitly avoid using 全然（ぜんぜん） with affirmative words in formal business settings, as older generations often perceive it as uneducated slang due to the post-WWII 'negative-only' rule.
• Standalone Usage: If the predicate is dropped (e.g., '全然！（ぜんぜん）'), the meaning depends on the context of the question. For example, if someone asks 'Does it hurt?' (痛い？（いたい？）), '全然！（ぜんぜん）' means 'Not at all!'. If someone asks 'Am I in your way?' (邪魔？（じゃま？）), '全然！（ぜんぜん）' means 'No problem!' or 'Totally fine!'.
• Formality: 全然（ぜんぜん） is conversational. For formal or objective writing, 全く（まったく） is preferred.