The most common way to say "tired" in Spanish is cansado (for males) or cansada (for females). It means physically tired and is widely used. To say "I am tired," you say:

• Estoy cansado (if you are male)
• Estoy cansada (if you are female)

There are other nuanced synonyms depending on the level or type of tiredness, such as:

• Agotado/a (exhausted, worn out)
• Rendido/a (exhausted)
• Exhausto/a (exhausted)
• Soñoliento/a or Somnoliento/a (drowsy, sleepy)
• Aletargado/a (lethargic, sluggish)
• Estoy harto/a (fed up or tired of something)

If you want to express sleepy tiredness (needing sleep), you say Tengo sueño , which means "I have sleepiness" but is used as "I am sleepy." In summary, to simply say "tired" in Spanish, use cansado/a and for "I'm tired," say:

• Estoy cansado (male)
• Estoy cansada (female)