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Webster 1828 Edition

adv.

Servilely; meanly; basely.

slavishly ‎(comparative more slavishly, superlative most slavishly)

In a slavish manner.
- 1840, James Fenimore Cooper, The Pathfinder:
  Although the words were not slavishly borrowed, the expressions partook of the simple dignity of the liturgy to which she had been accustomed, and was probably as worthy of the Being to whom they were addressed as they could well be made by human powers.

in a slavish manner