共々・共共|ともどもtomodomo[2]nakadaka (mid-high)

1. adverbtogether; in company
   私は彼かれともどもその企業きぎょうに参加さんかした。↗

   I share with him in the enterprise.

• SynonymともにNeutralTogether; stresses joint or simultaneous action and can also mean 'along with'. Broader in use than 「共々」.
• Synonym一緒にいっしょにCasualColloquial and the most common everyday word for 'together'; more casual than the written-flavored 「共々」.
• Related共々にともどもにWritten「共々」 with に added; same meaning and use, but rare even in writing.
• Related相共にあいともにWrittenLiterary and rarely used; stresses people acting together with one another.
• Antonym一人でひとりでCasualThe colloquial opposite of 「共々」: alone, by oneself, on one's own.
• Antonym単独でたんどくでNeutralThe neutral opposite of 「共々」: doing something alone, without relying on others.

「共々」 typically follows a noun, as in 「親子共々」 or 「夫婦共々お世話になります」. In ordinary speech 「一緒に」 or 「共に」 is the usual choice; 「共々に」 and 「相共に」 are rare literary forms. The opposite is 「一人で」 or 「単独で」.

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

1. 一緒いっしょに。互たがいに。もろとも。体言たいげんに後置こうちして副ふく助詞じょし的てきにも用もちいられる。