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нешуточный adj. stresses
gen.	earnest; no-nonsense (Anglophile); real (Tanya Gesse); for real (Tanya Gesse)
Gruzovik, inf.	grave; serious
inf.	wicked (ART Vancouver); not to be taken lightly
нешуточно adv.
gen.	unironically (dictionary.com Unarmed)
Игорь Миг	massively

нешуточный: 100 phrase in 4 subjects

General	91
Idiomatic	2
Informal	6
Slang	1