different between sillily vs silkily

English

silly +? -ly

sillily (comparative more sillily, superlative most sillily)

(dated or hypercorrect) In a silly manner; foolishly.
The man walked down the street so sillily that many a bystander stopped and stared slack-jawed.

silky +? -ly

silkily (comparative more silkily, superlative most silkily)

In a silky manner.
- 1922, James Joyce, Ulysses Chapter 13
  Gerty's were of the bluest Irish blue, set off by lustrous lashes and dark expressive brows. Time was when those brows were not so silkily seductive

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