When toward is used as an adjective, its meaning is not the same as that of the adverb or preposition. ... It developed its meaning from 'in the direction to' through various further meanings: 'approaching', 'coming [in time]', 'impending';

Is toward a verb or adjective?

Toward can be a preposition or an adjective.

Is towards an adverb?

Be careful: Towards is a preposition, not an adverb, so it is always followed by a noun or a pronoun.