Translation guide
Expressing that an action is done completely, carefully, or to the fullest extent. Japanese uses adverbs, verb endings, and compound verbs rather than a single equivalent.
The action is carried out fully, without leaving anything undone.
Attach きる to the masu-stem of a verb to mean 'do completely' or 'do to the end'. Often implies finishing something entirely.
I did my homework thoroughly (finished it completely).
He ran the marathon to the end.
Adverb meaning 'firmly', 'properly', or 'thoroughly'. Used with many verbs to indicate doing something with care and completeness.
Study thoroughly.
Please close the door firmly.
Adverb meaning 'thoroughly' or 'exhaustively'. Stronger and more formal than しっかり. Often used in business or serious contexts.
We investigated the problem thoroughly.
Adverb meaning 'completely' or 'entirely'. Often used when something is done to the point of changing a state.
I had completely forgotten.
The action is performed with attention to detail, not just completion.
Adverb meaning 'carefully', 'politely', or 'meticulously'. Implies doing something with great care and attention.
He wrote the letter carefully.
Adverb meaning 'elaborately', 'meticulously', or 'with great care'. Suggests extra effort to ensure perfection.
I cleaned thoroughly (with extra care).
Adverb meaning 'painstakingly' or 'assiduously'. Often used for detailed manual work or research.
He examined the materials thoroughly.
The action is done in depth, often for understanding or experience.
Covering all aspects, leaving nothing out.
しっかり is everyday and versatile, implying properness and reliability. 徹底的に is stronger and more formal, used for systematic or exhaustive actions.
English 'do thoroughly' cannot be directly translated as a single verb. Use adverbs or verb endings as shown above. Saying 'サラリとやる' is wrong; 'しっかりやる' is correct.
じっくり話し合おう。
Let's talk it over thoroughly.
The police searched thoroughly.