主として|しゅとしてshutoshite[1]atamadaka (head-high)

1. expression, adverbmainly; chiefly; primarily; for the most part
   これらの手紙てがみは主ぬしとして母ははから来きたものだ。↗

   These letters, in the main, are from my mother.

• Synonym主におもにNeutralNeutral adverb meaning mainly or mostly, common in speech, as in 「主に学生が使う」; 「主として」 sounds more written.
• Synonym大方おおかたWrittenWritten adverb for the greater part or a rough estimate; 「主として」 instead frames one thing as the focus.
• Synonym多くおおくNeutralNeutral adverb for the majority, or for often; 「主として」 instead frames one thing as the focus.
• SynonymたいていNeutralNeutral adverb meaning mostly, usually or probably; 「主として」 instead frames one thing as the main element.
• SynonymあらかたWrittenWritten adverb meaning almost all or roughly; 「主として」 instead frames one thing as the focus.
• RelatedだいたいNeutralNeutral adverb meaning on the whole or approximately; 「主として」 instead frames one thing as the main element.
• Related主おもWrittenWritten word; as 「主な」 it means main or chief, while 「主として」 is its adverbial use.
• Related概してがいしてWrittenWritten adverb meaning generally speaking or on the whole; 「主として」 instead frames one thing as the main element.
• RelatedほとんどNeutralNeutral adverb meaning almost or most; 「主として」 points to what is central rather than to quantity.
• Related総じてそうじてWrittenWritten adverb meaning on the whole or all in all; 「主として」 instead frames one thing as the main element.
• Antonym副としてWrittenWritten expression for something secondary or supporting; the opposite of 「主として」 in the main-versus-secondary contrast.

Use 「主として」 to say something is primarily or chiefly the case, with a written feel, as in 「主として学生向け」. In everyday speech prefer 「主に」. For general statements use 「概して」 or 「総じて」, and for almost use 「殆ど」; 「副として」 is its opposite.

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

1. ほとんどの場合ばあい、ある物事ものごとが中心ちゅうしんになっていることを表あらわす。