精査|せいさseisa[1]atamadaka (head-high)

1. noun, suru verb, transitive verbclose investigation; careful examination; scrutiny

• Synonym吟味ぎんみNeutralExamining something carefully to judge its quality before choosing, as in 「食材を吟味する」; the focus is on telling good from bad.
• Synonym検分けんぶんNeutralInspecting in person on the spot, as in 「現場検分」; the emphasis is on going to see for oneself.
• Synonym調べしらべNeutralGeneral word for an investigation; also means a tune or melody. Police questioning is 「取り調べ」.
• Synonym点検てんけんNeutralChecking things one by one, as in 「設備点検」; the usual word for routine inspection of equipment.
• Synonym監査かんさFormalFormal term for auditing and supervisory inspection, as in 「会計監査」.
• Synonym精察せいさつWrittenWritten and rare; stresses careful observation, while 「精査」 stresses minute scrutiny and examination.
• Synonym穿鑿せんさくWrittenWritten word for digging into things with persistent, prying questions; pejorative, and usually written 「詮索」.
• Related検査けんさNeutralChecking whether anything is wrong, as in 「健康検査」; the most common everyday word for an inspection or test.
• Related検閲けんえつNeutralExamining the content of publications and the like; carries the nuance of censorship by public authority.
• Related検視けんしFormalFormal term for officially examining a body or a crime scene; also to look into and establish facts; used mostly in legal and police settings.
• Related品定めしなさだめNeutralJudging and appraising people or things, as in 「品定めする」; colloquial, and often with a critical, fault-finding tone.
• RelatedただすWrittenVerb meaning to question someone to get at the truth; written style, with the emphasis on clarifying facts by asking.
• RelatedチェックCasualColloquial loanword for checking or verifying; the everyday go-to, but it lacks 「精査」's sense of minute scrutiny.
• Related監察かんさつFormalFormal, mainly administrative term for supervising and inspecting, with an eye to enforcement; not about minute scrutiny.
• Related評価ひょうかNeutralEvaluating or appraising something; the emphasis is on judging its worth, not on scrutinizing it in detail.
• Related閲するえっするWrittenLiterary verb for reviewing or inspecting documents; can also mean time passing; written and rather archaic.
• Antonym大雑把おおざっぱNeutralAntonym meaning rough, broad-brush or sloppy; the opposite of 「精査」's fine, detailed examination.
• Antonym粗検WrittenWritten antonym: a rough, cursory check — the opposite of 「精査」's minute scrutiny.

Use 「精査」 for close, minute investigation or scrutiny, as in 「データを精査する」. In everyday speech say 「調べる」 or 「チェック」; for checks use 「検査」 or 「点検」, and for an audit 「監査」. The rough opposite is 「大雑把」.

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

1. あることを詳くわしく調しらべること。