Arabic is interesting because of many elements. Proto-arabic is very Eastern as is Hebrew. However, Arabic was spread from the peninsula all way to the Levant and North Africa, and localised Arabic is quite different to Quranic Arabic (which is still expressed as a lingua franca in MSA- Modern Standard Arabic).

So Arabic picked up elements on a local area and culture and there is the cross pollination with Europe, bringing in Western elements. Thus, it doesn't quite fit in either character but the closer to the Arabian peninsula it gets, the more eastern in thinking with one curious caveat of both Arabic and Hebrew(and a significant one). Arabic was polytheistic for much of its history, which fits in with its Eastern mode, but this changed of course with Muhommed. Hebrew is even more unique as being clearly Eastern, and retaining that, yet is the source of monotheism for more than 1000 years earlier.

True Eastern thought survives in both religions as Sufism and Kabbalah.