Translation guide
In Japanese, expressing 'straight line' depends on whether you mean a geometric line, a direct path, a row of things, or a metaphorical directness. The most common word is 直線 (chokusen) for geometric lines, but other expressions are used for queues, routes, and abstract directness.
A line that does not curve, in mathematics or drawing.
The standard term for a straight line in geometry, drawing, or any context where a non-curved line is meant.
定規を使って直線を引いてください。
Please draw a straight line using a ruler.
この直線は無限に続きます。
This straight line continues infinitely.
Emphasizes a single, uninterrupted straight line. Often used for paths, roads, or arrangements that are perfectly straight.
この道は一直線に伸びている。
This road stretches out in a straight line.
Moving or going in a straight line without detours.
Adverb meaning 'straight' in terms of direction. Used with verbs of movement to indicate going straight ahead.
この道をまっすぐ行ってください。
Go straight along this road.
彼はまっすぐ家に帰った。
He went straight home.
Adverbial phrase meaning 'in a straight line', often implying a direct, unwavering path.
ボールは一直線に飛んでいった。
The ball flew in a straight line.
A row or queue arranged in a straight line.
Means 'one line' or 'single file'. Used for people or objects arranged in a straight row.
生徒たちは一列に並んだ。
The students lined up in a straight line.
Literally 'straight line/queue'. Used when emphasizing the straightness of the row.
まっすぐな列を作ってください。
Please form a straight line.
Being direct or straightforward in behavior, communication, or life path.
Adjectival phrase meaning 'straight' or 'direct', used for personality or approach.
彼はまっすぐな性格だ。
He has a straightforward personality.
Describes someone who is single-minded or unwavering, often in pursuit of a goal.
彼の夢に向かって一直線な姿勢がすごい。
His single-minded attitude toward his dream is amazing.
直線 is a noun meaning a geometric straight line. まっすぐ is an adverb/adjective meaning 'straight' in direction or character. Use 直線 for lines in drawings or math, and まっすぐ for giving directions or describing directness.