implausibly adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.

Is implausibly an adjective or adverb?

—implausibly adverb —implausibility /ɪmˌplɔːzəˈbɪləti $ -ˌplɒː-/ noun [uncountable]Examples from the Corpusimplausible• Well, you and other men of science seem to assume two things which I find rather implausible.

Is gradually a verb or adverb?

In a gradual manner; making slow progress; slowly.