Use 'masterful' to describe someone showing great confidence and skill in their actions. The chef's masterful handling of the kitchen impressed everyone.
Pro Tip 2/3
Positive Connotation
'Masterful' often implies admiration for someone's talent and high competency. With her masterful understanding of the law, she won the case easily.
Pro Tip 3/3
Subtle Praise
Calling an action 'masterful' subtly praises both the outcome and the person's ability. His masterful negotiation secured us a better deal.