different between deprecating vs depreciating

English

deprecating

deprecating (comparative more deprecating, superlative most deprecating)

In manner that deprecates; insulting; belittling.
- 1912, Lucy Maud Montgomery, Chronicles of Avonlea, Chapter I. The Hurrying of Ludovic, 7
  Theodora, with a deprecating look at Arnold Sherman, took his arm, and Ludovic marched her across the green amid a silence which the very horses tied to the storm fence seemed to share. For Ludovic 'twas a crowded hour of glorious life.
She looked at him with a deprecating smile on her face.
He raised his hand with a deprecating gesture.

depreciating

depreciating (comparative more depreciating, superlative most depreciating)

That is declining in value.
That degrades the value of something; deprecating.
- 1887, Sir Arthur Conan Doyle, A Study in Scarlet, VII:
  Gregson and Lestrade seemed to be far from satisfied by this assurance, or by the depreciating allusion to the detective police.

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