Usage patterns 念ねん 入い りに 〈 動どう 詞し 〉 to do (something) carefully and thoroughly
I thoroughly checked my luggage before departure.
念ねん 入い りな 〈 物もの 〉 careful, thorough (preparation, work, etc.)
Thanks to careful preparation, the presentation was a success.
Related words· 7 入念 and 念入り both mean 'careful and thorough', but 入念 sounds slightly more formal/written and is often used with 入念に〜する .
丁寧 stresses politeness and care in manner or handling, while 念入り focuses on thoroughness and leaving no detail unchecked.
慎重 means cautious and prudent, aimed at avoiding risk, whereas 念入り is about exhaustive, detailed care in doing something.
細心 highlights meticulous attention to tiny details (often in 細心の注意 ), while 念入り describes the overall thoroughness of an action or preparation.
Show 3 more Show fewer 念入り and 丹念 both describe doing something with great care, but 念入り is more commonly used adverbially (念入りに ) for everyday tasks like cleaning, while 丹念 suggests sustained, almost artisanal devotion to detail.
念入り is an adjectival noun meaning 'meticulous, careful', while よくよく is an adverb modifying verbs of thinking or looking.
念入り (usually as 念入りに ) emphasizes meticulous attention to detail, while じっくり emphasizes taking ample, unhurried time to do something properly.
Opposites いい加減 describes doing something carelessly or half-heartedly, the opposite of the meticulous care implied by 念入り .
念入り means thorough and painstaking effort, standing in contrast to なおざり , which means treating something without proper care.
Written forms 念ねん 入い り Usage 99%
Standard kanji spelling; high-frequency in news and general use.
ねんいり Usage 1%
Etymology Compound of 念 (care, attention) and 入り (entering, putting in), literally 'putting care into'. The exact historical derivation is uncertain, but the meaning has been stable as 'thorough, careful'.
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