せっかく
with (much) trouble, specially
Two trains and a bus to get here, and now you are talking about leaving. Sit down. The sack せっ is packed かく either way, so spend the afternoon as well: せっかく.
Marks effort already made that would otherwise go to waste. せっかくだから is since we are here anyway.
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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.