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неслыханный adj. stresses
gen.	beispiellos; unerhört; ungeheuer; ungeheuerlich; unqualifizierbar; unglaublich (Лорина); kaum zu fassen (Ремедиос_П)
book.	sondergleichen
inf.	bagebuchen; hagebüchen
inf., disappr.	bodenlos
obs.	hanebüchen
неслыханно adv.
gen.	ungeheuer; unglaublich (Лорина)

неслыханный : 28 phrases in 4 subjects

Avuncular	1
Bookish / literary	1
General	22
Informal	4