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закостеневший adj. stresses
gen.	fuddy-duddy; fuddy duddy; fossilized (Alex_Odeychuk)
inf.	fuddy
закостенеть v
gen.	become numb; become stiff
Gruzovik	grow stiff; be numb with; become numb with; ossify
Gruzovik, fig.	become stubborn; become incorrigible; become rigid