Nihoner
表層形
おそらく
オソラク
副詞

おそらく (オソラク)

Osoraku · おそらく — probably, (most) likely, in all likelihood, I suspect, I dare say, I'm afraid

Other ways to say “probably” in Japanese →

おそらく in rōmaji: osoraku.

副詞 * * *
📝 恐らく 🔤 * 📐 *
Updated: 2026年9月28日
📖 Grammar Information
表層形 (Surface)
おそらく
見出し語 (Lemma)
恐らく
読み (Reading)
オソラク
品詞 (POS)
副詞・*・*・*
活用型 (Conj. Type)
*
活用形 (Conj. Form)
*
表記 (Orthography)
おそらく
読み・基本形
オソラク
表記・基本形
おそらく
見出し語の読み
オソラク
How it's used

Used in both speech and writing when expressing a guess with some confidence, often with a nuance of caution or concern.

おそらく彼は来ないだろう。
Osoraku kare wa konai darou.
Probably he won't come.

明日はおそらく雨が降るでしょう。
Ashita wa osoraku ame ga furu deshou.
It will probably rain tomorrow.

⚖️ Often confused with 'tabun' (maybe), but 'osoraku' implies a higher degree of likelihood.

💡 English Meaning

おそらく means “probably, (most) likely, in all likelihood, I suspect, I dare say, I'm afraid” — full definition & examples →

⭐ Dictionary Form

恐らく (オソラク) — main entry →

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おそらく
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Reading & Info
オソラク
Lemma: 恐らく
副詞***
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💡
Did you know · 副詞
副詞 (adverbs) modify verbs, adjectives and other adverbs. Unlike English, Japanese adverbs don't change form — they're invariable.
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❓ About this entry
What is the difference between surface form and lemma? ▼
The surface form (おそらく) is the exact text as it appeared in the corpus — it may be conjugated or inflected. The lemma (恐らく) is the dictionary base form. For example, 食べた (surface) has the lemma 食べる.
What does the reading (pron) field mean? ▼
The reading shows the pronunciation in hiragana or katakana as recorded by UniDic. For kanji entries this is the standard reading of this specific surface form — which may differ from other readings of the same kanji.
What is UniDic? ▼
UniDic is a comprehensive Japanese lexicon developed by the National Institute for Japanese Language and Linguistics (NINJAL). It provides detailed morphological information for modern Japanese words, used in NLP tools like MeCab.
How do I save this entry? ▼
Click the ★ save button in the word card above (you need to be logged in). Saved entries appear in your personal Saved Dictionary page for quick review later.