Obsolete spelling of masterly

Executed in the manner of a master; showing competence and skill; masterful. / (usually derogatory, obsolete) Like a master; arbitrary; domineering, imperious.

(archaic) In a masterful manner; competently, masterfully.

The quality of being masterly.

(politics, public policy) A policy of deliberate inactivity, carried out with diplomatic skill, so as to preserve a predominant influence without risking anything.