Glossary entry (derived from question below)
Italian term or phrase:
deciso e minaccioso
English translation:
unfaltering and threatening
Italian term
Ireland
20 yrs+ quality translations, Trados
Native in: Spanish 
, English (Variants: British, Irish, UK, US)
Works in: English to Spanish, Spanish to English, Italian to English, 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
Seychelles
25 years experience constantly improving
Native in: English (Variant: British) 
Works in: Italian to English
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... |
Italy
Texts with zest by a Chartered Linguist
Native in: English (Variants: British, UK)
Works in: Italian to English, English
with a sinister edge
| Lol... ;) that sounds very gothic... |
loud and fearsome
Italy
CIOL-certified, humanities, tourism
Native in: English (Variant: British)
Works in: Italian to English
forceful and aggressive
Ireland
right word, right place. everytime
Native in: English (Variants: US, Canadian, Irish, UK)
Works in: French to English, Spanish to English, English, and 1 more.
rough-edged, slightly fearsome
United Kingdom
www.lingocraft.co.uk
Native in: English (Variants: British, Scottish, Irish, Singaporean, UK, South African)
Works in: French to English, Italian to English, Romanian to English, 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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