うっかり (translations)→ absentmindedly accidentally careless carelessly fear heedlessly inadvertent inadvertently injudiciously let nearly thoughtlessly uncertainly unguardedly unintentional unthinkingly venture
異変 (translations)→ event problem
間違い (translations)→ blob doubt error falsehood inaccuracy misconception mistake problematic question wrong
偶然 (translations)→ chance coincidence fluke fortuitously happenstance hazard pat
災難 (translations)→ disturbing fatality ordeal plague pratfall
事故 (translations)→ crash incident occurrence thing wreck
出来事 (translations)→ account business consequence episode matter sitting what