Not characteristic of elders; lacking the wisdom, dignity, or seriousness associated with elderly people.
From dis- (not/opposite) + elder (meaning older or senior). A formation meaning the opposite of elder-like dignity or authority.
Victorian writers used 'diselder' to scold young people acting immaturely—calling someone 'diselder behavior' was like saying 'you're acting beneath your age and station,' mixing social hierarchy with maturity expectations.
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