惚

hu̅ = hu + Ø1

indistinct

惚 character breakdown

惚
- 忄
- 忽
  - 勿
    - 丿
    - 勹
      - 丿
      - ㇆
        
        一
        
        亅
  - 心
    - 丶
    - 乚

忄

xi̅n = xi + (e)n1

Kangxi radical 61 (心) as a vertical side element

Looks a bit like a flail.

忽

hu̅ = hu + Ø1

to neglect / to overlook / to ignore / suddenly

忽 = 勿 + 心 : Helga Horse (hu) got new bat wings (勿) and carelessly (忽) flies around in front of the space station (Ø1). Suddenly (忽) she realizes there's no oxygen to breathe and the shock is enough to have her heart (心) nearly jump out of her chest.