The antonym for "am slothful" is "am active." Being active means to be energetic, lively, and industrious. It is the opposite of being slothful, which means being lazy, sluggish or idle. By being active, you can achieve your goals more quickly and efficiently. Being active not only increases your productivity, but it also enhances your physical and mental well-being. It improves your overall health, gives you more confidence, and promotes positivity. So, if you want to overcome slothfulness and achieve success in life, adopt an active lifestyle and make sure to stay motivated and focused.