Glossary entry (derived from question below)
English term or phrase:
the seven deadly sins damnable
Persian (Farsi) translation:
هفت گناه کبیره لعنتی
English term
Iran
Native in: Persian (Farsi) 
Works in: Persian (Farsi) to English, English to Persian (Farsi)
the seven deadly sins damnable
in such wise that pride,covetousness,wrath,and lechery,
now in this world be made commendable,
and thus they leave of angels the heavenly company.
Dec 14, 2012 08:08: Younes Mostafaei Created KOG entry
Proposed translations
Iran
+15 Years of Professional Experience!
Native in: Persian (Farsi) (Variant: Iranian (standard))
Works in: English to Persian (Farsi), English to Dari, Persian (Farsi) to English
هفت گناه کبیره لعنتی
http://en.wikipedia.org/wiki/Seven_deadly_sins
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Note added at 6 mins (2012-11-30 09:36:25 GMT)
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هفت گناه کبيره (seven deadly sins) که با نام مفاسد عظيم (capital vices) يا گناهان اصلي (cardinal sins) نيز شناخته مي شوند ، اعمال يا رفتاري هستند که در آموزه هاي اوليه مسيحيت بسيار مورد نکوهش بوده و عبارتند از : شهوت (lust) ، شکم پرستي (gluttony) ، طمع (greed) ، تنبلي (sloth) ، خشم (wrath) ، حسد (envy) و غرور (pride)
http://haft-eghlim.blogfa.com/post-32.aspx
هفت گناه کبیره
http://fa.wikipedia.org/wiki/هفت_گناه_کبیره
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Spain
Building Trust by Excellence
Native in: Persian (Farsi) 
Works in: English to Persian (Farsi), Persian (Farsi) to English, Spanish to Persian (Farsi), and 2 more.
هفت گناه بسیار قبیح
معاصی کبیرۀ مستوجب عقوبت
Iran
Quality Translator and Freelancer
Native in: Persian (Farsi) , English
Works in: English to Persian (Farsi), Persian (Farsi) to English
هفت گناه کبیره ای که مستوجب لعن الهی هستند
United States
Farsi/Dari translator/ Cultural advisor
Native in: Persian (Farsi)
Works in: Dari to English, English to Dari, Persian (Farsi) to English, and 1 more.
هفت گناه ملعون کبیره
United States
Quality Is the Best Business Plan!
Native in: Persian (Farsi)
Works in: English to Persian (Farsi), Persian (Farsi) to English
Discussion
In Dr. Reza Bateni's dictionary, POOYA dictionary I mean, for deadly you can see the meaning of گناه کبیره.
So, I think you can use it without any doubt.
adjective [before noun]
of great importance; main:
a cardinal rule/error/sin
کبیره در فارسی به معنای بزرگ بودن از جهت وقاحت است و اگر میزان وقاحت یک گناه زیاد باشد لفظ کبیره برای آن به کار می رود در زبان انگلیسی نیز واژه «کاردینال» در همین معنا به کار می رود.د
I hope I've been clear enough!
The seven deadly sins, also known as the capital vices or cardinal sins, is a classification of objectionable vices (part of Christian ethics)
Moreover there are lots of entries on the web for «هفت گناه کبیره».