declarative adverb
Linguistics term for adverbs that express the speaker's attitude or judgment toward the proposition, often requiring a specific sentence-ending form (e.g., 決して…ない, まるで…ようだ).
"Kesshite" is one of the declarative adverbs, and it is accompanied by a negative expression at the end of the sentence.
情態副詞 (manner adverb) describes how an action is performed (e.g., ゆっくり), while 陳述副詞 expresses the speaker's attitude and influences the sentence modality.
程度副詞 (degree adverb) indicates the degree or extent (e.g., とても), whereas 陳述副詞 relates to the speaker's subjective stance and often calls for a specific grammatical form.
Compound of 陳述 (statement, declaration) and 副詞 (adverb). A technical term in Japanese grammar.