The antonyms for the word "more riskless" are plentiful. Here are a few examples:
1. Unsafe: The opposite of a riskless situation is an unsafe one. When an activity or situation is unsafe, it requires caution or avoidance altogether.
2. Dangerous: Similarly, a dangerous situation carries a high degree of risk. It often presents potential harm or injury to individuals involved.
3. Risky: The word "risky" means the same thing as "more riskless." However, in this case, "risky" describes situations with a higher degree of potential hazard or danger.
4. Hazardous: Another antonym is "hazardous," which refers to something that presents danger, risk, or harm. A hazardous situation might be dangerous, unsafe, or risky.