In a blameful manner; with blame or culpability; in a way full of blame.
From 'blameful' plus the adverb suffix '-ly.' This adverbial form intensifies the accusatory nature of an action or statement.
Adding '-ly' to '-ful' words creates this intensified sense—'blamefully' sounds much stronger than just 'blamably,' like the action is saturated with blame!
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