Well actually it can be used as an adverb AND a preposition! :)
It can be, but without is almost always a preposition. It acts like an adjective or adverb when the object is omitted. It is most clearly an adverb when used in the pairing "within and without" which refers to an adjective. It is not clearly an adverb in the usual example "to do without" (something).
An adverb describes a verb, an adjective or another adverb.
The word small can be an adjective or an adverb.
Approximate is an adjective, approximately is an adverb.
Persistence is not an adjective or an adverb. It's a noun.
It is an adjective (without end, or tediously long). The adverb form is endlessly.
Direct can be an adjective, a verb and an adverb. Adjective: Without interruption/Straight. Verb: To control/To aim. Adverb: Directly.
It can be, but without is almost always a preposition. It acts like an adjective or adverb when the object is omitted. It is most clearly an adverb when used in the pairing "within and without" which refers to an adjective. It is not clearly an adverb in the usual example "to do without" (something).
No sunless is not a adverb it is an adjective what it means is without sun
Yes, you can have a sentence without a adjetive or adverb phrase. For example, Her name is Sally. No adverb or adjetive!
No, the word infallible is an adjective. The adverb form is "infallibly" (without error).
Yes, it can be either an adjective or adverb. It can mean continuously, or traveled without stopping.
Dark can be an adjective or a noun. Darkly is an adverb.
The adverb form of the adjective immediate is immediately (right now, without delay).
Night: noun an: adverb adjective: adjective noun: noun adverb: adverb
No, it is not an adverb. The word unspotted is an adjective that means without spots or stains, or colloquially, unseen (not "spotted").
"Direct" can function as both an adjective and an adverb, depending on the context. As an adjective, it describes something that is straightforward or without intermediaries, such as in "a direct route." As an adverb, it typically appears in the form "directly," meaning in a straightforward manner, as in "He spoke directly to her."