Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
unconditional [ʌnkənˈdɪʃənl] adj (acceptance, obedience) безусло́вный*безусло́вен (discharge, surrender) безогово́рочный*безогово́рочен
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: