Glossary entry (derived from question below)
Italiano term or phrase:
deciso e minaccioso
Inglese translation:
unfaltering and threatening
Italiano term
Irlanda
20 yrs+ quality translations, Trados
Native in: Spagnolo 
, Inglese (Variants: UK, US, British, Irish)
Works in: Da Inglese a Spagnolo, Da Spagnolo a Inglese, Da Italiano a Inglese, and 8 more.
deciso e minaccioso
Il blues è autentico, diretto, onesto, sia che si tratti di un canto dolce come quello di Bobby "Blue" Bland o deciso e minaccioso come quello di Howlin' Wolf, si tratta sempre di Blues.
Qui, nella penombra, comodamente allungato sul mio divano, assecondo il suo ritmo, abbandonato alle emozioni.
Proposed translations
Seicelle
25 years experience constantly improving
Native in: Inglese (Variant: British) 
Works in: Da Italiano a Inglese
unfaltering and threatening
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Note added at 41 mins (2012-03-16 11:10:38 GMT)
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I listened to him as a teenager when he was still alive and singing and he died in 1976. I would go with Oliver's answer.
A dark side.
http://www.youtube.com/watch?v=tyfgb9sDT1I
http://www.lyrics007.com/Howlin' Wolf Lyrics/Spoonful Lyrics...
| Lol...never thought you as an old pensioner Jim, that and the fact that you're a fellow diver makes you cool ;) no matter what age...but yes...these sofas are ...something else... |
Italia
Texts with zest by a Chartered Linguist
Native in: Inglese (Variants: UK, British)
Works in: Da Italiano a Inglese, Inglese
with a sinister edge
| Lol... ;) that sounds very gothic... |
Italia
Native in: Inglese (Variant: British)
Works in: Da Inglese a Italiano, Da Italiano a Inglese
loud and fearsome
Italia
CIOL-certified, humanities, tourism
Native in: Inglese (Variant: British)
Works in: Da Italiano a Inglese
forceful and aggressive
Irlanda
right word, right place. everytime
Native in: Inglese (Variants: Irish, UK, US, Canadian)
Works in: Da Francese a Inglese, Da Spagnolo a Inglese, Inglese, and 1 more.
rough-edged, slightly fearsome
Regno Unito
www.lingocraft.co.uk
Native in: Inglese (Variants: Irish, Singaporean, UK, South African, British, Scottish)
Works in: Da Francese a Inglese, Da Italiano a Inglese, Da Rumeno a Inglese, and 2 more.
bold and ominous / (or steady and ominous)
"mid-tempo driving, dramatic orchestral theme, STEADY beat with OMINOUS and BOLD melody"
http://www.auraclemusic.com/search/moods/91
"Struttin' Blues...This music is BOLD, proud and resonant - perfect for use in a wide variety of productions...."
"Songs written in minor keys can be sad, mysterious, OMINOUS even. To the listener, they deliver an incredible variety of emotional ranges."
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