人生|じんせいjinsei[1]atamadaka (head-high)

1. noun(one's) life
   できるあいだに人生じんせいを楽たのしみなさい。↗

   Enjoy your life while you are able to.

• Synonym生涯しょうがいNeutralOne's whole life or life story, whether looking back or ahead, as in 「生涯を閉じる」「生涯学習」; also an adverb meaning 'for life'.
• Synonym一生いっしょうNeutralThe whole period from birth to death, frequent in speech, as in 「一生忘れない」; 「人生」 stresses the experiences and meaning of living.
• SynonymライフNeutralA loanword meaning life or living; mostly appears in compounds such as 「ライフスタイル」 and is rarely used on its own.
• Synonym一生涯いっしょうがいWrittenAn emphatic version of 「一生」 with a heavier tone, as in 「一生涯の友」; found mainly in written prose.
• Synonym畢生ひっせいWrittenWritten word for one's whole life, as in 「畢生の大作」; used of undertakings that absorb a lifetime's devotion.
• Related暮らしくらしNeutralEveryday life or livelihood, as in 「暮らしが楽になる」; 「人生」 refers to life as a whole.
• Related生活せいかつNeutralDaily living or livelihood, centred on concrete matters of food, clothing and shelter; 「人生」 stresses the course and meaning of one's life.
• Related寿命じゅみょうNeutralThe length of a life or of a device's useful life, as in 「平均寿命」「電池の寿命」; no nuance of lived experience.
• Related一期いちごWrittenA written term with Buddhist overtones meaning one's life; most familiar from 「一期一会」.
• Related一世いっせいWrittenA lifetime or a generation; also the first of a line, as in first-generation immigrants or 'Elizabeth I'; mostly in fixed expressions.
• Related一代いちだいNeutralA generation, or the period someone reigns or heads a family, as in 「一代で財を築く」.
• Related生存期間せいぞんきかんWrittenMedical and legal term for the length of time a person or animal is alive, e.g. a patient's survival period; no sense of lived experience.
• Related命数めいすうWrittenOne's lifespan or heaven-allotted destiny, also one's fated span, as in 「命数が尽きる」; strongly literary.
• Related生活様式せいかつようしきWrittenLifestyle, used mainly in sociology, as in 「生活様式の変化」; close to 「人生」 only in the sense of how one lives.

Use 「人生」 for the experiences and meaning of a life. For the whole span from birth to death pick 「一生」, for one's whole life or life story 「生涯」, and for daily living 「生活」 or 「暮らし」. 「寿命」 is lifespan, 「ライフ」 a loanword mostly in compounds, 「一代」 a generation, and 「生活様式」 lifestyle. The rest — 「一生涯」「畢生」「一期」「一世」「生存期間」「命数」 — are written words for a lifetime or one's allotted span.

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

1. 人間にんげんがこの世よに生いきていくこと。
2. 人間にんげんがこの世よに生いきている期間きかん。