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Webster 1828 Edition

adv.

Fitly; agreeably; with propriety. Let words be suitably applied.

suitably ‎(comparative more suitably, superlative most suitably)

In a suitable manner; fitly; agreeably; with propriety.
- 1963, Margery Allingham, chapter 5, in The China Governess:
  Mr. Campion appeared suitably impressed and she warmed to him. He was very easy to talk to with those long clown lines in his pale face, a natural goon, born rather too early she suspected.

in a suitable manner