His experience told him that intervention was too dubious a responsibility to be lightly incurred; the possible issue either of an endeavor to restore the former relations with Lucy and Philip, or of counselling submission to this irruption of a new feeling, was hidden in a darkness all the more impenetrable because each immediate step was clogged with evil.
Come in, Miss, for goodness do," she went on, opening a side door, and endeavoring to flatten her person against the wall to make the utmost space for the visitor.
There are no more uses of "endeavor" in the book.
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I endeavored to get both sides to agree to a compromise.