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без устали stresses
gen.	without turning a hair; no rest for the weary (Nata Shkoda); full steam (Побеdа); untiringly; unwearyingly; hard; tirelessly; unceasingly; indefatigably (Anglophile)
Gruzovik	tirelessly; unweariedly; untiringly (без у́стали)
Gruzovik, obs.	unwearyingly; unceasingly
idiom.	beaver-like (Andrey Truhachev)

без устали: 13 phrases in 5 subjects

Figurative	1
General	8
Idiomatic	2
Makarov	1
Mass media	1