Translation guide
Describes something that happens without prior planning, spontaneously, or by chance. Japanese distinguishes between positive spontaneity, neutral lack of planning, and negative unexpectedness.
Expressing that an action or event was done without planning, often with a sense of freedom or naturalness.
Adverb meaning 'suddenly' or 'abruptly'. Used for unplanned events that happen without warning, often neutral or slightly surprising.
突然雨が降り出した。
It suddenly started raining.
Adverb meaning 'unexpectedly' or 'by chance'. Conveys a pleasant or neutral surprise, often for unplanned positive outcomes.
思いがけず旧友に会った。
I unexpectedly ran into an old friend.
Adverb for doing something on a whim or without deep thought, often for minor actions or realizations.
ふと空を見上げた。
I casually looked up at the sky.
Noun/adjective meaning 'haphazard' or 'unplanned'. Often used for travel or decisions made on the fly, with a slightly reckless nuance.
行き当たりばったりの旅が好きだ。
I like unplanned trips.
Indicating that something was not scheduled or prepared in advance.
Noun meaning 'unscheduled' or 'not in the plan'. Used for events or actions that deviate from a schedule.
予定外の出費がかさんだ。
Unplanned expenses piled up.
Noun meaning 'outside the plan'. Similar to 予定外 but emphasizes lack of prior planning rather than deviation from a schedule.
計画外の訪問だった。
It was an unplanned visit.
Noun/adjective meaning 'without a plan' or 'haphazard'. Often carries a negative connotation of being disorganized.
Describing something that happens by accident, especially with undesirable consequences.
Noun/adjective meaning 'unexpected' or 'sudden'. Often used in phrases like 不意に (unexpectedly) or 不意打ち (surprise attack).
不意の来客に驚いた。
I was surprised by the unexpected visitor.
Adjective meaning 'accidental' or 'incidental'. Used in formal contexts for unplanned events like accidents.
Adverb meaning 'unintentionally'. Emphasizes lack of intent, often for mistakes or unforeseen outcomes.
意図せず彼を傷つけてしまった。
I unintentionally hurt him.
突然 is the most common word for 'suddenly' and can be used in both positive and negative contexts. 不意 emphasizes the unexpectedness and often implies a lack of preparedness, frequently used in negative situations.
Direct translations like 非計画 (ひけいかく) are not natural Japanese. Use context-appropriate terms like 予定外 or 突然 instead.
無計画な開発は環境を破壊する。
Unplanned development destroys the environment.
It was an accidental incident.