In a manner showing moderation and self-restraint, especially regarding food and drink; in a temperate and frugal way.
From abstemious (Latin abstemius, possibly from ab- 'away from' + temetum 'intoxicating drink') plus -ly. An archaic but still-used word emphasizing moral temperance.
The original Latin root suggests someone who stays 'away from intoxicating drinks'—so abstemiously living means being restrained and disciplined, like monks or ascetics living very simply.
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