In a canting or hypocritical manner; with insincere or sanctimonious tone.
From canting plus the adverbial suffix -ly, which converts adjectives into adverbs. This formation became standardized in 17th-century English as cant-related vocabulary expanded.
This adverb lets you describe the exact way someone *sounds* when being fake about their values—the special combination of self-righteousness and false sincerity that makes you immediately distrust them.
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