The hardest part of answering this question is determining what you mean by opposite. As admonition is a gentle reproof, its technical opposite should be something that is a harsh encouragement, something like the kind of loud cheer you might hear at a sporting event. But if I were pressed for a word I would say "hosanna". However, if you are looking for something that means a harsh reproof than perhaps you should go with "rebuke." If you want something that is a gentle encouragement than just go with "encouragement".
The opposite of to rebuke is to praise, commend, laud, or applaud.
A rebuke is a strong criticism or denunciation, and the opposite would be praise, compliment, or commendation.
warning
reproof, blame, scolding, rebuke, admonition, censure, lecture, reprehension
The Police officer gave me much admonition towards crossing the broken bridge.
The cautionary admonition is two words: be careful.
wait for details
What is synonym for merchant? What is synonym for merchant?
reproof, blame, scolding, rebuke, admonition, censure, lecture, reprehension
alerts, warns, admonition, counsels, forewarning, hints, omen, sign, tip-off
yes you can admonition in a sentence
Okay... admonition - admit = onion
approval
fission,mission admonition
advice
The Police officer gave me much admonition towards crossing the broken bridge.
The verb form of "admonition" is "admonish." It means to admonish or reprimand someone, usually for their behavior or actions, in a strict or serious manner.
Another word or synonym for caution would be admonishment, admonition, advice, alarm, alert, calculation, cautiousness, caveat, circumspection, concern, cunctation, discretion, forethought, observance, portent, prudence, vigilance, wariness, warning, watchfulness.
An admonition is similar to a correction or a reprimand. It usually refers to a verbal correction rather than a physical punishment. For example, you may receive an admonition at work for being out of uniform or arriving late. It's can also be thought of as a first warning.
A tedious moralizing lecture or admonition.