strenuously

English

strenuously (comparative more strenuously, superlative most strenuously)

In a strenuous manner.
- 1749, [John Cleland], “(Please specify the letter or volume)”, in Memoirs of a Woman of Pleasure [Fanny Hill], London: […] [Thomas Parker] for G. Fenton [i.e., Fenton and Ralph Griffiths] […], →OCLC:
  By my direction, however, the head of his unwieldy machine was so critically pointed that, feeling him foreright against the tender opening, a favourable motion from me met his timely thrust, by which the lips of it, strenuously dilated, gave way to his thus assisted impetuosity, so that we might both feel that he had gain'd a lodgement.