4 words for FU 1–2 letters

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1 letter (2)

f u
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2 letters (2)

fu uf
Sickness – Sartre’s first novel
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Hint 1 meaning
Seasickness; hence, any similar sickness of the stomach accompanied with a propensity to vomit; qualm; squeamishness of the stomach; loathing.
Hint 2 anagram
UAAESN
Hint 3 another clue
PERPLEXED state
21 +1