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страшно adv. stresses
gen.	it's terrible; it's terrifying
страшный adj.
gen.	frightful; dreadful; awful; agonizing; fearful; formidable; hair-raising; horrible; tremendous; desperate; dire; direful; flagrant; forbidding; grim; hideous; horrid; lurid; virulent; woeful; charnel; ghastful; haggish; spine-chilling (часто о фильме, романе); chilling; gruesome; hairy; parlous; grisly; grizzly; spookish; spooky; skanky (What's wrong with being a little skanky? – Ну и что такого, что она немного страшная? She's so skanky. That grody hairdo doesn't help either – Она такая страшная. Да и эта позорная прическа её не красит Andy); scary (q3mi4); uncanny (Anglophile); towering (Aly19); menacing (Aly19); appalling (MargeWebley); graphic (для восприятия: graphic images • graphic descriptions of the victims ART Vancouver); hair raising; spine chilling; awesome; ghoulish; grueling; gastful; redoubtable; gash (GrimFace); dreaded (Dollie); freak (VLZ_58); disturbing (Ремедиос_П); ugly (в значении "уродливый" I. Havkin); crawly (Taras); dismal; ghastly (Taras); creepy crawly; fierce (She was suffering through fierce [=excruciating] pain. george serebryakov); enormous (Игорь Глазырин); terrible (с усил. знач.); drear; dreary; grim-faced; grim visaged; haggard; rabid (о голоде); racking; startling; frightening (with dat., to); grimly; ghastly; daunting (Zippity); scathing (VLZ_58); deuced; sinful; sinister; grotesque (VLZ_58)
Gruzovik	terrifying
Игорь Миг	egregious
abbr.	bally
amer., uncom.	pokerish
emph.	hell of a; perishing; blue; disastrous; grievous
fig.	nasty (Vadim Rouminsky)
formal	deplorable (The company has shown a deplorable [=appalling, unconscionable] lack of concern for the environment. VLZ_58)
Gruzovik, inf.	monstrous
humor.	fearsome
inf.	unholy; haircurling; mortal; terrific; creepy; creepy-crawly
Makarov.	black; dangerous; deadly
obs.	dread; affrightful; drad; periculous
psychiat.	virulent (о болезни и т.п.)
psychol.	virulent (о болезни и т. п.)
slang	gosh-awful; greeby; bugly (Vitusa); unearthly (Interex); furry
страшное adj.
Makarov.	raw head and bloody bones (что-либо)
страшно adv.
gen.	devilishly; formidably; deadly; awfully; terrible; gruesomely (Mira_G); frightening (triumfov); sorely (VLZ_58); terribly; frightfully; horribly; dreadfully; bally; ghastly (Taras); grimly; with a vengeance; horrible; awful; afraid (with dat.); forbiddingly (MayLily); horridly; terrifically
Gruzovik	it's terrible; it's terrifying
Игорь Миг	monumentally
book.	direly
emph.	desperate; fearfully; confoundedly; desperately; disgustingly; beastly; hideously
inf.	tearing; like crazy (VLZ_58)
Makarov.	tremendously
obs.	direfully; plaguily; ghastfully
slang	fierce

страшно: 712 phrases in 44 subjects

Africa	1
American usage, not spelling	9
Australian	2
Avuncular	2
Bible	4
Biology	4
British usage, not spelling	4
Chess	1
Christianity	10
Cinematography	1
Clerical	1
Cliche / convention	5
Contextual meaning	1
Demography	1
Diplomacy	1
Emphatic	2
Figurative	4
Figure of speech	1
General	321
Herpetology incl. serpentology	2
Humorous / Jocular	1
Idiomatic	16
Informal	62
Journalism terminology	1
Latin	1
Law	5
Literature	4
Makarov	156
Mass media	2
Medical	1
News style	1
Notarial practice	4
Obsolete / dated	3
Politics	2
Proverb	5
Psychology	1
Quotes and aphorisms	2
Religion	37
Rhetoric	4
Saying	1
Scottish usage	1
Slang	20
Vulgar	4
Yiddish	1