The antonyms for "more disease free" are "infected," "sick," "diseased," "unhealthy," and "contaminated." More specifically, "infected" refers to a state of being diseased with a virus, bacteria, or other infectious agent. "Sick" and "diseased" both imply a state of ill health, typically due to a chronic or acute medical condition. "Unhealthy" suggests a condition that is not conducive to good health, such as a poor diet or lack of exercise. "Contaminated" refers to the presence of harmful substances or microbes, which can lead to disease if ingested, inhaled, or otherwise exposed to. In sum, the antonyms for "more disease free" all imply some degree of illness or harm to one's health.