oathable

oathable

(ˈəʊθəbəl)
adj
having the ability to take an oath or to be believed while on oath
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014