一向|いっこうikkou[0]heiban (flat)

1. adverbcompletely; absolutely; totally
2. adverb(not) at all; (not) a bit; (not) in the leastin a negative sentence
3. adverbearnestly; intently; determinedly
4. nounJōdo Shinshū

• SynonymまるっきりCasualColloquial. With a negative it means 'completely not', as in 「まるっきり分からない」; more casual in tone than 「一向」.
• SynonymまったくNeutralVery common. Means 'completely' or 'truly', and with a negative stresses 'not at all'; it also serves as the exclamation 「全く」, so its range is wider than 「一向」.
• Synonym一切いっさいNeutralWith a negative it means 'not at all, none whatsoever', as in 「一切関係ない」, in a more emphatic tone; it is also a noun meaning 'everything', a use 「一向」 lacks.
• SynonymさっぱりNeutralWith a negative it means 'not at all', as in 「さっぱり分からない」; its basic senses are 'refreshed' and 'neat', which 「一向」 does not have.
• Synonym全然ぜんぜんNeutralCommon in speech. With a negative it means 'not at all'; 「一向」 is a bit more written and usually appears as 「一向に」.
• Synonym皆目かいもくWrittenWritten style. With a negative it means 'not at all', often with 'no idea', as in 「皆目見当がつかない」; more literary than 「一向」.
• SynonymちっともCasualColloquial. With a negative it means 'not at all', as in 「ちっとも知らない」; often carries a complaining tone, and is more casual than 「一向」.
• Synonym少しもすこしもNeutralWith a negative it means 'not at all'; neutral and common, it can replace 「一向に〜ない」 with a plainer tone.
• SynonymからっきしCasualColloquial. With a negative it means 'utterly no good', said mostly of ability or skill, as in 「からっきし駄目」; 「一向」 is not limited to ability.
• SynonymまるきりCasualColloquial. With a negative it means 'completely not'; synonymous with 「丸っきり」, and more casual than 「一向」.
• SynonymとんとNeutralMostly with a negative, meaning 'not at all', as in 「とんと見かけない」; the nuance is somewhat old-fashioned, but the sense is close to 「一向」.
• SynonymさらさらNeutralWith a negative it means 'not the slightest', said mostly of willingness or intention, as in 「その気はさらさらない」; 「一向」 is not limited to such contexts.
• SynonymおさおさWrittenWritten style. With a negative it means 'not at all', seen in set phrases like 「おさおさ劣らない」; the tone is archaic, and 「少しも」 is the everyday choice.
• SynonymてんでCasualColloquial. With a negative it means 'not at all', as in 「てんで話にならない」, often with a scornful tone; it can also mean 'extremely'.
• Synonym毫もごうもWrittenWith a negative it means 'not in the least'; highly literary, found mainly in prose. In everyday speech use 「少しも」 or 「全然」.
• SynonymつゆいささかもWrittenWith a negative it means 'not even a bit'; the tone is archaic and it is rarely used today; 「少しも」 can be substituted.
• Synonym一つもひとつもCasualWith a negative it means 'not a single one, not at all', focusing on a count of zero; common in speech and more casual than 「一向」.
• RelatedまんざらNeutralWith a negative it means 'not altogether'; 「満更でもない」 is a mild, roundabout affirmation, so the sense differs from 「一向」's complete negation.

「一向に〜ない」 means 'not at all, never', as in 「一向に分からない」 or 「一向に気にしない」. In speech, 「全然」 and 「ちっとも」 are the usual choices; in writing, 「皆目」 or 「少しも」 work well.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. （下したに打ち消うちけしの語ごを伴ともない）少すこしも～ない。
2. 全まったく。全然ぜんぜん。
3. ひたすら。
4. 全まったくひどいさま。
5. 一向いっこう宗そう。