accusingly
Concise Oxford English Dictionary © 2008 Oxford University Press:
accuse/əˈkjuːz/
▶verb charge with an offence or crime.
■ (accuse someone of) claim that someone has done something wrong.
– derivatives
accusatory adjective,
accuser noun,
accusing adjective,
accusingly adverb.
accusatory adjective,
accuser noun,
accusing adjective,
accusingly adverb.
– origin ME: from OFr. acuser, from L. accusare ‘call to account’, from ad- ‘towards’ + causa ‘reason, motive, lawsuit’.
'accusingly' also found in these Oxford entries:

