The phrase "bad periods" can describe a number of unpleasant situations or experiences. However, there are several antonyms that can provide more positive descriptions. For example, instead of "bad periods," one could use "good times," "happy occasions," "joyful moments," or "blissful periods." Similarly, "difficult times" can be replaced with "easeful periods," "comfortable moments," or "manageable situations." Using antonyms can help shift the focus from negativity to positivity and help to reframe difficult experiences in a more positive light.