皆無|かいむkaimu[1]atamadaka (head-high)

1. na-adjective, no-adjectivenonexistent; nil; none; nothing (at all); bugger-all

• Synonym無むWrittenNothing, nonexistence; used alone as in 「無になる」「好意を無にする」 and as a prefix in 「無資格」. 「皆無」 stresses not even a little.
• Synonym絶無ぜつむWrittenAbsolute nonexistence; a written/formal word whose emphasis is as strong as 「皆無」.
• RelatedなしNeutralA plain, colloquial way to say 'none' or 'without', as in 「砂糖なし」. 「皆無」 stresses there is not even one and sounds written/formal.
• Related零れいNeutralThe number zero, somewhat formal, as in 「零下」「零点」. Said of a complete absence it lacks the emphatic force of 「皆無」.
• RelatedゼロNeutralThe same word as above, also written 「０」「〇」. For 'completely none' in speech 「ゼロ」 is usual, as in 「可能性はゼロ」.
• Related0NeutralThe Arabic-numeral form, read 「ゼロ」 or 「れい」; it too can mean complete absence, as in 「在庫0」「可能性は0」, mostly in data and signage.
• Antonym多数たすうNeutralA large number or the majority — the opposite of 「皆無」's complete absence.
• Antonym豊富ほうふNeutralAbundant, plentiful — the opposite of 「皆無」's having nothing at all.

Use 「皆無」 to stress that there is not even one, as in 「可能性は皆無だ」. In speech say 「ゼロ」 or 「全くない」; for a plain 'none' use 「なし」. 「絶無」 is equally emphatic but strictly written. The antonyms 多数 and 豊富 describe the opposite: many, or plentiful.

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

1. 全まったく無ないこと。
2. 全まったく無ないさま。
3. （下したに否定ひてい語ごを伴ともなって）全まったく。皆目かいもく。まるで。さっぱり。