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бесстрастный adj. stresses
gen.	dispassionate; composed; unemotional; stolid; detached; dry; impassible; impassive; nonchalant; passionless; cold-livered; emotionless; flameless; poker-faced; unimpassioned; dead-pan; bloodless; phlegmatic; phlegmy; placid (Rust71); cold livered; poker faced; unmoved; indifferent; impassionate (maystay); immovable; blase (Roman.Selivanov); passionateless (Alex_Odeychuk); neutral (His face settled into a neutral mask Побеdа); imperturbable (Olya34); expressionless (Olya34); hollow (Olya34); indolent; unpassionate
Gruzovik	calm
Игорь Миг	insensitive (It's my job to be insensitive.)
disappr.	aseptic
inf.	hard-nosed (Сергій Саржевський); tough as nails (chronik); desensitized (insensitive Val_Ships)
Makarov.	devoid of animation; frigid; glacial
nonstand., amer.	nonplussed (Namecollector)
psychol.	impersonal; nonemotional (ProfitNews)
slang	dead pan; deadpan
бесстрастно adv.
gen.	phlegmatically; dead-pan; unemotionally (Азери); in a clinical fashion (DC); emotionlessly (partofechelon); in cold blood ("Surely there are details in her story which, if we looked at it in cold blood, would excite our suspicion." (Sir Arthur Conan Doyle) ART Vancouver); nonchalantly (shergilov); dispassionately; expressionlessly (VadZ); immovably (Aly19); frigidly; impassively (maystay)
Игорь Миг	with equanimity
fig.	clinically (sophistt)

бесстрастный: 41 phrases in 8 subjects

American usage, not spelling	3
General	23
Idiomatic	1
Informal	2
Makarov	7
Mass media	1
Quotes and aphorisms	1
Slang	3