Note 24 — Section 183. REBECCA DESCRIBES THE SIEGE OF TORQUILSTONE (App. § 5) TO THE WOUNDED IVANHOE[1]. I.
Reading edition
highest = strongest. The relative superlative of adverbs is formed by placing am before the superlative of the adjective, and giving it the dative termination en, like the predicative form of adjectives. Comp. S. 120, N. 14.