different between ungrammatical vs ungrammatically

English

un- +? grammatical

ungrammatical (comparative more ungrammatical, superlative most ungrammatical)

(linguistics) In violation of one or more of the rules and conventions of a language as defined by the grammar, resulting in unacceptable or incorrect usage.

In formal linguistics, ungrammatical sentences are labelled using an asterisk (*):

*The subject of this sentence is.

This convention goes back at least as far as Leonard Bloomfield's Language (1933).

ungrammatical +? -ly

ungrammatically (comparative more ungrammatically, superlative most ungrammatically)

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