Definify.com

Webster 1913 Edition

adv.

In an improper manner; not properly; unsuitably; unbecomingly.

adv.

Not fitly; in a manner not suited to the end; in a manner not suited to the company, time, place and circumstances; unsuitably; incongruously.

In a manner not according with established usages; inaccurately; ungrammatically; as, to speak or write improperly.

improperly ‎(comparative more improperly, superlative most improperly)