単独|たんどくtandoku[0]heiban (flat)

1. no-adjective, na-adjectivesole; single; solo
   不幸ふこうは決けっして単独たんどくでは来こない。↗

   Misfortunes seldom come singly.
2. nounindependence; singleness; singularity

• SynonymひとりNeutralCovers being one person or alone, and also being single or unmarried. 「単独」 is more written in tone and stresses a single subject acting by itself.
• Antonym共同きょうどうNeutralThe direct opposite of 「単独」 in the alone-versus-joint contrast: it describes two or more people doing something together or in cooperation.
• Antonym合同ごうどうNeutralOpposes 「単独」 on the single-versus-combined axis: it describes holding or organizing something jointly, with separate parties merged into one.
• Antonym集団しゅうだんNeutralContrasts with 「単独」 as group versus individual: it denotes a collective, a gathering of many people or things.

Use 「単独」 for something done by one person or a single subject alone, as in 「単独行動」; it leans toward written prose, so in speech 「一人で」 is more natural. The antonyms are 「共同」 (jointly), 「合同」 (combined) and 「集団」 (as a group).

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

1. 自分じぶん一人ひとりであること。一人ひとりで行おこなうこと。
2. ただ一ひとつだけであるさま。一ひとつだけで成立せいりつするさま。