This is a regular verb. It follows the conjugation pattern of the verb hablar.
PresentPresente
Si te descuidas, el perro come tu comida.
If you get careless, the dog eats your food.
PreteritePretérito indefinido
Me descuidé y el arroz se quemó.
I got careless and the rice burned.
Present SubjunctivePresente de subjuntivo
No quiero que ella se descuide con el dinero.
I don't want her to get careless with the money.