主任|しゅにんshunin[0]heiban (flat)

1. nounperson in charge; senior staff; manager; chief; head
   その問題もんだいは主任しゅにんをひどく苦くるしめた。↗

   The problem tortured the chief.

• SynonymチーフNeutralLoanword for a supervisor or person in charge, as in 「チーフデザイナー」; used across design, editing, technology and food service. Neutral.
• Related上司じょうしNeutralA general term for anyone holding a higher position than you, as in 「上司に報告する」; unlike 「主任」 it names no specific post.
• Related上役うわやくCasualColloquial and somewhat old-fashioned word for a superior, as in 「上役に睨まれる」; nowadays 「上司」 is the usual choice.
• RelatedボスCasualColloquial loanword for a boss, gang leader or a game's boss enemy; broader and more casual than 「主任」.
• RelatedリーダーNeutralLoanword for the person leading a team, as in 「チームリーダー」; stresses guiding the group rather than holding a titled post.
• Related長ちょうNeutralChief or head, also a strong point; mostly a suffix in titles like 「部長」「社長」, rarely standing alone.
• Related指導者しどうしゃNeutralA leader or mentor, as in 「国の指導者」; leans formal and stresses guiding others rather than a company post.
• RelatedフォアマンNeutralLoanword for a foreman or crew boss, used mainly in factories; narrower than 「主任」.
• Related職長しょくちょうNeutralA foreman who directs and supervises workers on-site at factories and construction jobs; a specific workplace role, not a general title.
• Antonym部下ぶかNeutralA subordinate who works under and takes orders from someone above; the opposite of 「主任」.
• Antonym平社員ひらしゃいんNeutralAn ordinary employee with no title; the opposite of 「主任」.

Use 「主任」 for the person in charge of a specific task or post, as in 「学年主任」「主任研究員」. For a superior in general say 「上司」; for the one leading a team, 「リーダー」; the loanword 「チーフ」 fits fields like design or food service. 「上役」 and 「ボス」 are colloquial; 「長」 mostly appears in titles. The opposites are 「部下」 and 「平社員」.

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

1. ある任務にんむで中心ちゅうしんとなって責任せきにんを取とる人ひと。また、その役職やくしょく。