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Webster 1913 Edition

Adj.

[Cf. F.

surmontable

Capable of being surmounted or overcome; superable.

–

Sur-mount′a-ble-ness

Noun.

Adj.

That may be overcome; superable.

surmountable ‎(comparative more surmountable, superlative most surmountable)

Able to be surmounted or overcome; defeatable.
Now that we have done the impossible we can finish it, all that remain are rather easy and surmountable obstacles.