難事|なんじnanji[1]atamadaka (head-high)

1. noundifficulty

• Synonym困難こんなんNeutralThe most general word for difficulty itself, as in 「困難を乗り越える」; 「難事」 names a specific matter that is hard to accomplish.
• Related問題もんだいNeutralThe all-purpose word for a problem, question or issue; 「難事」 is more written in tone and points to something hard to accomplish.
• Related障害しょうがいWrittenWritten/formal; an obstacle or hindrance that blocks progress, and also a disability — the nuance is blocking, not a task hard to accomplish.
• Related厄介事やっかいごとCasualColloquial; a troublesome, bothersome matter — the nuance is being a hassle rather than hard to accomplish; 「難事」 is written in tone.
• Antonym易事WrittenWritten/formal antonym: an easy matter, the direct opposite of 「難事」.
• Antonym簡単なことNeutralNeutral antonym: a simple, easy thing, contrasted with 「難事」's hard-to-handle matters.

For difficulty in general use 「困難」, for problems use 「問題」. 「難事」 is written/formal for something very hard to accomplish, as in 「至難の業」「難事業」; 「厄介事」 is colloquial for a troublesome chore. Antonyms: 「易事」 (written) and 「簡単なこと」.

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

1. 対処たいしょや解決かいけつするのが困難こんなんな事柄ことがら。