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Results found in several dictionaries: Collins, Collaborative Dictionary
nombriliste 
  adj self-absorbed

Collaborative Dictionary     French-English
nombriliste n. 1) navel-gazer (m), 2) navel-gazer (f) Reverso General Dictionary 
nombrilistes n. 1) navel-gazers (pl.m.), 2) navel-gazers (pl.f.) Reverso General Dictionary 
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'nombriliste' also found in translations in English-French dictionary
navel-gazing exp. nombriliste Reverso General Dictionary 
navel gazer n. le nombriliste Reverso General Dictionary 

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