Boyishly

adv. [f. prec. + -LY².] In a boyish manner, like a boy.

1581.  J. Bell, Haddon’s Answ. Osor., 64. And the same question repeateth agayne and agayne very boyeshly.

1807.  Anna Porter, Hungar. Bro., I. i. 29. To hide the sensibility, which boyishly he blushed at.

1849.  Stovel, Canne’s Necess., Introd. p. cvii. Boyishly exclaiming, ‘No bishop, no king.’