In a manner characteristic of evangelism or evangelists; with fervent enthusiasm for spreading a gospel or belief.
From 'evangelistic' plus '-ally' (adverb suffix converting adjectives to adverbs). A modern formation following standard English word-building patterns.
When you add '-ally' to an adjective, you're technically adding both '-al' and '-ly'—so 'evangelistically' is a double suffix transformation showing how English can stack modifiers to build precise meanings!
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