In a manner that discourages or prevents someone from doing something by creating fear or doubt.
From 'deterrent' (something that discourages action) plus the adverb suffix '-ly'. The root comes from Latin 'deterrere' (to frighten away).
When a parent speaks 'deterrently' about punishment, they're using their tone and words to make you think twice before misbehaving—it's psychology in action!
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