steadfast
Concise Oxford English Dictionary © 2008 Oxford University Press:
steadfast /ˈstɛdfɑːst, -fəst/
▶adjective resolutely or dutifully firm and unwavering.
– derivatives
steadfastly adverb,
steadfastness noun.
steadfastly adverb,
steadfastness noun.
'steadfast' also found in these Oxford entries:

