恐らく
Probably, Perhaps, (Most) likely, (I) fear that
Structure
Explanation
The adverb 恐らく originates from a conjugated form of the classical yodan verb, 恐る, meaning 'to fear'. In modern usage, 恐らく serves as a formal expression for 'probably' or 'likely'. It is commonly paired with other speculative grammar forms, including だろう and かもしれない.
Because 恐らく functions as an adverb, it is typically placed at the beginning of a clause to introduce a likely prediction or inference.
- あの人気のレストランはいつも混んでいるから、おそらく予約しないと入れないでしょう。That popular restaurant is always crowded, so you probably can't get in without a reservation.
- 田中さんは最近ずっと忙しそうだから、おそらく疲れているに違いない。Tanaka-san has seemed really busy lately, so he's likely exhausted.
- おそらくこの会議は長くなるだろうから、先にトイレに行っておこう。This meeting will probably be long, so let's go to the restroom beforehand.
While 恐らく can imply the nuance of 'I'm afraid that...', it is not restricted to negative situations. The feeling it conveys is often one of cautiousness from the speaker, suggesting they are presenting a conclusion based on evidence, but with a degree of reservation about its certainty.
Fun-fact
Yodan verbs, known as 四段活用, represent a verb conjugation class from classical Japanese. In the modern language, these have mostly been superseded by godan verbs (う-Verbs).
Examples
恐らくこの会議は時間どおりに終わらないだろう。
This meeting most likely won't end on time.
恐らく彼は試験に落ちる。
Perhaps he will fail the exam. (I fear that...)
こんなに交通量が多かったら、恐らく約束の時間に間に合いっこないでしょう。
If there's this much traffic, we most likely won't be able to make it in time for our appointment. (I fear that...)
「あーあ、恐らく今年は海外旅行に行けそうにないな。」
'Oh man, it looks like I probably won't be able to travel abroad this year.' (I fear that...)
今から出れば、恐らく電車に間に合うでしょう。
If you leave now, you will most likely catch the train.
このペースで進めば、プロジェクトは恐らく来週までに終わるでしょう。
If we continue at this pace, the project will probably be finished by next week.
空模様から判断すると、恐らく午後は雷雨でしょう。
Judging from the look of the sky, there will most likely be a thunderstorm this afternoon.
彼の顔色が悪い。恐らく体調が良くないのだろう。
He looks pale. Most likely, he isn't feeling well. (I fear that...)
この事件の鍵を握っているのは、恐らくあの目撃者の証言だろう。
Probably, the key to this case is that witness's testimony.
客：「この料理はいつ出てきますか？」店員：「恐らくあと１０分ほどでお持ちします。」
Customer: 'When will this dish be ready?' Staff: 'Probably in about 10 more minutes.'
アナリスト：「最新のデータを見ると、恐らく経済は回復傾向にあるだろう。」
Analyst: 'Looking at the latest data, the economy is most likely on a path to recovery.'
コーチは「彼の怪我は恐らく次の試合までに治らないだろう」と語った。
The coach stated that 'his injury will most likely not heal in time for the next game'.