The antonyms for "more tonic" are "less tonic," "weaker," "debilitating," "sedative," "depressant," and "unstimulating." While "more tonic" refers to something that invigorates and energizes the body, the antonyms of this phrase indicate the opposite effect. For instance, if you consume a less tonic drink, it may not provide the same level of energy and alertness compared to a more tonic beverage. A sedative, on the other hand, may make you feel sleepy or lethargic. It's important to understand the antonyms for "more tonic" to make informed choices about what you eat and drink to achieve a desired effect on your body.