ずっとzutto

1. adverbcontinuously; the whole time; all the way; throughoutずーっと is emphatic
   ６時じからずっと待まっているのだが、僕ぼくの番ばんがまだ来こない。↗

   I've been waiting since six o'clock and still my turn hasn't come.
2. adverbmuch (more); (by) far; far and away; a lot; a great deal
   この時計とけいはあれよりもずっと高価こうかだ。↗

   This clock is far more expensive than that.
3. adverbfar (away); long (ago, before, after)
   この慣習かんしゅうは、ずっと前まえから廃止はいしされている。↗

   This practice has long since been done away with.
4. adverbstraight; directly
   コンピューター端末たんまつはずっと一列かずなみに並ならんでいた。↗

   The computer terminals were lined up in one long row.

• Synonym延々えんえんNeutralStretches on endlessly, often with a tinge of tedium, as in 「延々と続く」; 「ずっと」 is neutral and can also mean 'by far'.
• Synonym長々ながながNeutralDraws things out at length, often long-windedly, as in 「長々と話す」; can also describe lying stretched out. 「ずっと」 just marks long duration.
• Synonym絶えずたえずWrittenWritten/formal: without interruption, constantly, as in 「絶えず変化する」. 「ずっと」 is more colloquial and stresses long duration.
• SynonymいつまでもNeutralFor however long, with no end in sight, as in 「いつまでも待つ」; also of the past, 「いつまでも遊んでいた」. 「ずっと」 can also mean 'by far'.
• Synonym末永くすえながくNeutralForever, for many years to come; used in well-wishes like 「末永くお幸せに」 and refers only to the future.
• Synonym続けてつづけてNeutralOne after another in succession, as in 「三日続けて休む」; stresses repetition. 「ずっと」 stresses an unbroken stretch.
• Related明け暮れあけくれWrittenWritten/formal: from morning to night, usually as 「～に明け暮れる」, absorbed in something all day; 「ずっと」 only says it continues.
• Related四六時中しろくじちゅうNeutralAround the clock, as in 「四六時中スマホを見る」; hyperbolic and often critical. 「ずっと」 is plainer.
• Related常々つねづねWrittenWritten/formal: habitually, as in 「常々思っている」; stresses what has always been true in ordinary days.
• Related夜昼よるひるWrittenWritten/formal and dated: day and night without pause, as in 「夜昼なく働く」; everyday speech prefers 「昼も夜も」.
• Related日夕にっせきWrittenWritten/formal old word for day and night or toward evening; virtually unused today. Say 「ずっと」 for continuous duration.
• Related明けても暮れてもあけてもくれてもNeutralIdiom: from morning to night, day after day, as in 「明けても暮れても勉強」; carries an exclamatory tone.
• RelatedのべつCasualColloquial: nonstop, endlessly, usually in 「のべつ幕なしに」; disparaging. 「ずっと」 is neutral.
• AntonymひとときNeutralA short, often pleasant while, as in 「楽しいひと時」; the opposite of the long stretch of 「ずっと」.
• Antonym一瞬いっしゅんNeutralA blink-of-an-eye instant, as in 「一瞬迷った」; the opposite of the long duration of 「ずっと」.

「ずっと」 covers long unbroken duration or a big difference ('much more'). For nonstop occurrence say 「絶えず」, for endless stretches 「延々」, for 'however long' 「いつまでも」, and for lasting well-wishes 「末永く」; 「ひと時」 and 「一瞬」 are its opposites, for brief moments.

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

1. 他ほかと比較ひかくして差さが大おおきいさま。かけ離はなれているさま。はるかに。もっともっと。
2. 状況じょうきょうが長ながく続つづいているさま。たえまなく。
3. 残のこすところなく動作どうさを及およぼすさま。すみずみまで。
4. ためらわずに動作どうさするさま。ずいと。ずいっと。