faithfully
Concise Oxford English Dictionary © 2008 Oxford University Press:
faithfully/ˈfeɪθfəli/
▶adverb in a faithful manner.
– phrases
yours faithfully Brit. a formula for ending a formal letter in which the recipient is not addressed by name.
yours faithfully Brit. a formula for ending a formal letter in which the recipient is not addressed by name.
'faithfully' also found in these Oxford entries:

