不必要|ふひつようfuhitsuyou[2]nakadaka (mid-high)

1. na-adjective, noununnecessary; needless
   あなたは不必要ふひつような語ごは消けしたほうがよい。↗

   You should cross out any word you don't need.

• Synonym不要ふようNeutralMeans not needed; common on signs and in administrative language, as in 「予約不要」 and 「不要品」. Close to 「不必要」 but shorter.
• Synonym無用むようNeutralCovers useless as well as unnecessary, as in 「心配無用」; on signs it can also mark prohibition, as in 「立入無用」.
• Related余計よけいNeutralSuggests something superfluous or intrusive, as in 「余計なお世話」; it carries a dismissive, annoyed tone.
• Related過剰かじょうNeutralRefers to excess, going beyond the proper range; the emphasis is on there being too much of something.
• Related過多かたNeutralMeans an excessive amount and is used mostly in compounds, as in 「情報過多」.
• Antonym必要ひつようNeutralMeans necessary; the direct opposite of 「不必要」.
• Antonym必須ひっすNeutralMeans indispensable or essential; also the opposite of 「不必要」.

For what is not needed or superfluous, use 「不必要」, as in 「不必要な出費」. Signs and administrative language prefer 「不要」; in everyday speech say 「いらない」 or 「余計」; for excess amounts use 「過剰」. The opposite is 「必要」.

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

1. 必要ひつようでないもの／こと。
2. 必要ひつようでない。