Expresses subjective certainty or conviction about a fact or situation. Often used in the form 確かな + noun or 確かに + verb.
It's not certain whether he will come.
We need definite proof.
reliable; trustworthy; accurate
Describes a person, information, or method that can be trusted or relied upon. Often used with nouns like 情報, 筋, 方法.
This is information from a reliable source.
He has reliable skills.
if I remember correctly; if I'm not mistaken
Adverbial use, often at the beginning of a sentence, to express a recollection that the speaker is not 100% sure about. Commonly used as 確か〜.
If I remember correctly, he moved last year.
If I'm not mistaken, the meeting was from 3 o'clock.
I obtained reliable information.
He did indeed say that.
If I remember correctly, he was off yesterday.
This craftsman's skill is dependable.
確か describes something certain or reliable, the opposite of 怪しい used to mean doubtful or uncertain.
確か means certain or sure, contrasting with あやふや's sense of being uncertain or unreliable.
confirmation; verification; checking
reliable source
Irregular okurigana usage; rarely seen.