Exacagender
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Exacagender is an idingender identity in which one's gender is some form/subset of genderfluid; when they feel like it is too exhausting to figure out what their gender is at any given time, possibly due to stress, burnout, or depression, their gender reverts back to a base gender, which can be any gender(s). When they have the energy to think about what their gender is, it shifts normally.
Though it is not exclusive, exacagender can be a neurogender related to one's depression or mental illness because of how their level or energy is affected by their mental illness.
Etymology
"Ex“ in the gender's name comes from the English word "exhausted".