The mere statement of the fact would have rendered it innocuous.
…bangs irrationally against a window-pane, the drawing-room naturalist may forget that under less artificial conditions it is capable of measuring distances and drawing conclusions with all the accuracy needful to its welfare; and the fact that Mr. Rosedale’s drawing-room manner lacked perspective made Lily class him with Trenor and the other dull men she knew, and assume that a little flattery, and the occasional acceptance of his hospitality, would suffice to render him innocuous.
There are no more uses of "innocuous" in the book.
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She made some innocuous comments while being careful not to hurt anyone’s feelings.
Her comments were innocuous, but he quoted them out of context to make them appear sinister.