すっかり
all, completely
He went for milk and bread and came home with neither, having not so much forgotten as never once thought of it. Not しっかり in the least: すっかり, and completely so: すっかり.
Sounds like しっかり, firmly, and means nothing whatever like it.
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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.