なんとなく
for some reason
Nothing is wrong with the party and nobody has upset you, and you would still rather not go. The same nanny なん as 何, shrugging rather than asking: なんとなく.
何だか なんだか and どうも do much the same job. 何となく leans on there being no reason you could name.
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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.