たしか
certainly, surely, if I'm not mistaken...
Solid enough to lean on, except that this one wobbles a bit. The meeting is at three. Ta たし, ka か, and she can check it if you want it in writing: たしか.
確かに means definitely. 確か in front of a statement does the opposite, hedging it: fairly sure, would not swear to it. きっと is confident where 確か hedges.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.