Its function is the same as that of an adverb (promptly) or an adverbial phrase (on the stroke of the bell).
The adverbial adjective "needlessly" explains the broad distinction.
A prepositional phrase may be either adjective or adverbial.
It has, perhaps, its origin in the adverbial character of that gender.
According to their use as parts of speech, subordinate clauses are adjective, adverbial, or noun clauses.
When it is used in this manner, it loses its adverbial force.
Upon this knowledge alone can a rational idea of the adverbial objective be built.
Other examples are rare, and I have not found any instance of an adverbial use.
A simile—in grammatical terms, an adverbial phrase—sometimes constitutes the second element.
The simple predicate may be modified by an adverbial objective ( 109).