Creepingly

adv. [f. prec. + -LY².] In a creeping manner. lit. and fig.

1548.  Thomas, Ital. Dict., Carpone, creepyngly, as he that goeth on all fower.

1573.  Tusser, Husb. (1878), 17. Age comming on so creepinglie.

1675.  Phillips, Theatr. Poet., Pref. (T.). That the poem be not … creepingly low and insipid.

1816.  L. Hunt, Rimini, III. 460. Pretending not to see The latter [satyrs] in the brakes come creepingly.