Questions & Answers about Estoy todo cansado hoy.
Both mean that you’re very tired, but:
- Estoy muy cansado = neutral, standard Spanish. You can use it in any context.
- Estoy todo cansado = more colloquial and informal, sounds like everyday spoken Spanish in Spain (especially among younger people).
Nuance:
- muy cansado focuses on degree (“very tired”).
- todo cansado sounds a bit more expressive / dramatic, like “so / completely tired”, and clearly informal.