Neither. Least is superlative.
little, less, least
superlative
comparative
No, the word 'mysterious' is an adjective, the positive form.Nouns do not have comparative forms.Adjectives have positive, comparative, and superlative forms; for example:mysterious (positive)more mysterious (comparative)most mysterious (superlative)
comparative
comparative
more positive
The 3 forms of adjectives are comparative, superlative, and positive. Example: Positive- bad Comparative- worse Superlative- worst
The answer to that question is comparative.
more positive, most positive
positive
Less IS the comparative form of little, least is the superlative form of littlelittle less least