Translation guide
The English word 'thorough' describes something done completely, with great attention to detail, or covering all aspects. In Japanese, there is no single direct equivalent; instead, various adjectives, verbs, and adverbs are used depending on whether you mean 'complete', 'detailed', 'meticulous', or 'exhaustive'.
Describing an action, investigation, or knowledge that is comprehensive and leaves nothing out.
A na-adjective meaning 'thorough' or 'exhaustive'. Often used for investigations, cleaning, or reforms.
He conducted a thorough investigation of the issue.
A na-adjective meaning 'sufficient' or 'thorough' in the sense of being enough. Often used for preparation or explanation.
Thorough preparation is necessary.
A na-adjective meaning 'meticulous' or 'detailed'. Used for plans, investigations, or analysis.
We made a thorough plan.
A na-adjective meaning 'scrupulous' or 'thorough'. Often used for careful preparation or consideration.
We paid thorough attention.
Emphasizing carefulness and attention to detail in work or examination.
An i-adjective meaning 'detailed' or 'meticulous'. Commonly used for instructions, work, or observations.
He is thorough and notices even the small details.
A na-adjective meaning 'painstaking' or 'thorough'. Often used for careful work or research.
A na-adjective meaning 'careful' or 'thorough'. Used for preparations or checks.
Expressing that an action is done completely or to the fullest extent.
An adverb meaning 'completely' or 'thoroughly'. Often used for changes of state or completion.
I had thoroughly forgotten about him.
Adverbial form of 徹底的, meaning 'thoroughly' or 'exhaustively'.
I cleaned the room thoroughly.
A colloquial adverb meaning 'thoroughly' or 'to the end'. Used in casual speech.
Describing someone who knows a subject completely or has deep understanding.
There is no single Japanese word that covers all uses of 'thorough'. Translating directly as 'thorough' in every context will sound unnatural. Choose the word that matches the specific nuance: completeness, detail, or intensity.
She gave a thorough explanation.
We need a thorough review of the policy.
丹念な調査が行われた。
A thorough investigation was carried out.
入念なチェックが必要だ。
A thorough check is necessary.
とことん話し合おう。
Let's discuss it thoroughly.
彼はコンピューターに詳しい。
He has a thorough knowledge of computers.