Definition of subjectly in US English:

subjectly

adjective

rare
  • Obedient, submissive.

adverb

  • In the manner of a subject; obediently, submissively. Now rare.

Origin

Late 16th century; earliest use found in Acts of the Privy Council. From subject + -ly<br>late 15th century (in an earlier sense). Probably partly from subject + -ly, and partly from subject and -ly.