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Webster 1913 Edition

adv.

by creeping slowly; in the manner of a reptile; insidiously; cunningly.

How slily and

creepingly

did he address himself to our first parents.

South.

adv.

By creeping; slowly; in the manner of a reptile.

creepingly ‎(comparative more creepingly, superlative most creepingly)

By creeping, moving stealthily and slowly; insidiously; cunningly.
How slily and creepingly did he address himself to our first parents. — South.