Simply is an adverb (in a simple way, or literally).
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Strangely is an adverb (oddly, unusually). The adjective form is simply strange.
The word skilfully is an adverb.The adjective form of the word is skilful.
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.