With strict observance of rule or usage; rigorously, scrupulously; punctiliously, with complete propriety.

With minute attention to, or insistence on, points of conduct or etiquette; with strict observance of rules or obligation; scrupulously…

With formality of manner, ceremoniously.

With reference to conduct or behaviour: scrupulously, punctiliously. Obsolete.

In a punctilious manner; with scrupulous attention to fine points of procedure, etiquette, or conduct.

In a stiff, formal, or prim manner; starchily.

In a stiff and unyielding manner.