What Arabic words are difficult to translate into English?

Dear Aya, there are many words in the arabic language that are difficult to translate. Qur'an is a clear example, where you can find1 word translated into a whole sentence. In arabic there is more than100 words that means "Love" (هوى، ولع، غرام، عشق، وجد....) while most of them are always translated into one word which is (Love).

Arabic language is known as a rich language, so if the other language is poor in its synonymous, you may encounter this difficulty. 

I hope I was helpful to you with my answer, wish you all the best,

Eslam

names of countries

The word for 'Please'.  

English/American/European/African speakers use the word 'Please' very often.

We hear Shuk'ran (thank you) many times during the day, but rarely the arabic word for 'Please'

terms that explain islam-specific conditions, such as: العدة بعد الطلاق and الظهار

dear aya i think modern English can translate whatever words in other languages

.some vegetables and fruits

Every day we have new words

According to the situation and the meaning we can translate

Arabic words that are difficult to translate into English are generally terms that do not have an equivalent in the target culture/language. In such case we resort to "transliteration" which means writing the Arabic word  in English letters; additionally, in order to explain the meaning of the transliterated word, a translator may insert his comment in a footnote for that purpose.