💡 Detailed Explanation
"怠る" (okotaru) means to neglect a duty or responsibility. It is commonly used with words like "practice" (練習). "劣る" (otoru) means to be inferior to something else. "衰える" (otoroeru) means to decline or weaken, which is the result of neglecting practice, not the action itself. "怠ける" (namakeru) means to be lazy, but "怠る" is a better fit for neglecting a specific, required task.