Probably
Perhaps, Likely
adverb
The kanji in this word means fear, but the word itself means probably. I guess you only have to fear something if it's probably going to happen, you know?
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned this reading already so you should be able to read it!
それは恐らく本当のことだと思います。
I think that's probably true.
彼は恐らくそのニュースを知っているはずです。
He probably knows about the news.
恐らくこれが最後のチャンスでしょう。
This is probably the last chance.
犯人は恐らくこの辺りにひそんでいるのでしょう。
The criminal is probably lurking in this area.