果てしない・果てし無い|はてしないhateshinai[4]nakadaka (mid-high)

1. i-adjectiveendless; boundless; everlasting
   この果はてしない宇宙うちゅうにいるのは、私わたしたち人類じんるいだけですか？↗

   Are we humans alone in this infinite universe?

• 1.
  Synonym限りないかぎりないNeutralAlso means boundless, but often stresses an extremely high degree, as in 「限りない愛」; 「果てしない」 leans toward endlessness in space or time.
• 2.
  SynonymエンドレスNeutralLoanword for something endless or looping over and over, as in 「エンドレスで流す」; 「果てしない」 leans toward vastness and long span.
• 3.
  Synonym計り知れないはかりしれないNeutralMeans immeasurable or beyond estimation, as in 「計り知れない損失」; it stresses depth of degree, while 「果てしない」 stresses breadth of extent.
• 4.
  Synonym無限むげんNeutralMeans infinity, leaning toward mathematical and abstract uses; 「果てしない」 is the subjective feeling of no end in sight.
• 5.
  Synonym無尽蔵むじんぞうWrittenWritten/formal; describes an inexhaustible supply, as in 「無尽蔵の資源」; the focus is on sheer quantity, while 「果てしない」 focuses on having no end.
• 6.
  Synonym果てしがないはてしがないNeutralNearly identical to the headword; it simply inserts 「が」 in the middle, and the usage is essentially the same.
• 7.
  SynonymきりのないCasualColloquial; means going on and on with no end, often with a note of exasperation, as in 「言い出したら切りがない」; 「果てしない」 can carry a sense of grandeur.
• 8.
  Synonym尽きないつきないNeutralMeans inexhaustible—talk that never runs out, supplies that never deplete, as in 「話が尽きない」; the focus is on not running dry, while 「果てしない」 stresses having no end.
• 9.
  Related永遠えいえんNeutralRead 「とわ」; means eternity with a literary flavor, focused on time; 「果てしない」 can also describe boundless space.
• 10.
  Related悠久ゆうきゅうWrittenWritten/formal word for time stretching far into the distant past or future, as in 「悠久の歴史」; 「果てしない」 can also describe boundless space.
• 11.
  Related無制限むせいげんNeutralMeans unrestricted, as in 「無制限に使える」; it concerns rules and conditions, while 「果てしない」 refers to having no end.
• 12.
  Related広大無辺こうだいむへんWrittenWritten four-character idiom describing vast, boundless land, sky, or the universe; 「果てしない」 can also refer to endlessness in time.
• 13.
  Related無窮むきゅうWrittenWritten/formal word for the infinitude of time and space, as in 「天壌無窮」; rare in everyday use, where 「果てしない」 or 「無限」 is said instead.
• 14.
  Related無辺際むへんさいWrittenWritten/formal term for boundless extent, rarely used; in everyday speech 「果てしない」 or 「限りない」 is more natural.
• 15.
  Related止めどないとめどないNeutralDescribes something that cannot be stopped and keeps flowing, as in 「とめどなく涙が流れる」; 「果てしない」 stresses the absence of an end.
• 16.
  Related無極むきょくWrittenWritten/formal word for endlessness; also a philosophical term for the limitless. In everyday speech, 「果てしない」 is used.
• 17.
  Antonym果てるはてるNeutralAntonym (verb): to end, run out, or perish—the opposite of the endlessness of 「果てしない」.
• 18.
  Antonym有限ゆうげんNeutralAntonym: finite or limited, the direct opposite of the boundlessness of 「果てしない」.

Use 「果てしない」 for something with no end in sight, as in 「果てしない旅」—endlessness in space or time. For an extremely high degree, say 「限りない」; for abstract or mathematical infinity, 「無限」; for something going on tediously with no end, 「切りがない」. Written terms like 「広大無辺」「悠久」「無窮」 and 「無尽蔵」 suit formal prose, and 「エンドレス」 covers looping repetition. Antonyms: 「果てる」 and 「有限」.

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

1. 終おわりの無ない。
2. 限かぎりが無ない。