UNFLAGGINGLY
Scrabble letter values: U1N1F4L1A1G2G2I1N1G2L1Y4 = 21
Definition
UNFLAGGINGLY is the adverb form of UNFLAGGING.
adjective UNFLAGGING: showing sustained enthusiastic action with unflagging vitality.
Synonyms of UNFLAGGING: indefatigable, tireless, unwearying