In a compulsative manner; with compulsion or force (corresponding adverb form of 'compulsative').
From 'compulsative' plus the adverbial suffix '-ly,' creating an adverb from the adjective variant of compulsive.
Adverbs like this show the cascade of suffixes English allows—we can build 'compulsate → compulsative → compulsatively,' each layer adding grammatical function.
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