How does "The proposal is worth considering" contain an adverbial objective? [duplicate]

Solution 1:

Worth is somewhat a controversial word, there is a dispute about it being an adjective or a preposition (especially in sentences like It is worth two dollars). McCawley, R. Hyddleston and G. Pullum call it an adjective.

I don't see any NOUN in your sentence that functions as an adverb modifying a verb. In

The proposal is worth considering.

H&P say that worth is an adjective functioning as a predicate, while considering is a hollow gerund-participial that functions as a complement of the adjective worth. (See The Cambridge Grammar of the English Language, pp. 546 and 607)