from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. By creeping, moving stealthily and slowly; insidiously; cunningly.
from the GNU version of the Collaborative International Dictionary of English
- adv. by creeping slowly; in the manner of a reptile; insidiously; cunningly.
from The Century Dictionary and Cyclopedia
- By creeping; slowly; with the motion of an insect or a reptile.
creeping + -ly (Wiktionary)