Sad – triste
(Pronounced trees-tay)
To remember that sad is pronounced trees-tay (triste) in Spanish, use the following mnemonic:
She was sad because she'd wanted the tree to stay (triste).

Examples of triste (sad) in a sentence
Estoy muy triste porque perdí a mi perro.
(I am very sad because I lost my dog.)
La música me pone triste a veces.
(The music makes me sad sometimes.)
Ella tiene una expresión triste en su cara.
(She has a sad expression on her face.)