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難しい むずかしい
difficult; hard; troublesome; complicated; serious (disease, problem, etc.)
困難 こんなん
difficulty; hardship; trouble; distress
避難 ひなん
taking refuge; finding shelter; evacuation; escape; seeking safe haven
非難 ひなん
criticism; blame; censure; attack; reproach
難易 なんい
(relative) difficulty