Learn gender endings. If you are referring to a woman or an object with a feminine ending (generally "-a"), then most adjectives will end in "-a." If you are referring to a man or an object with a masculine ending (generally "-o"), then most adjectives will end with an "-o."
Say Bella/Bello. This is the word that will probably be listed first in any English-Spanish dictionary. Phonetically, it is pronounced "BAY-yah" or "BAY-oh" based on gender.
Use Hermosa/Hermoso. This is another commonly used adjective meaning "beautiful" or "lovely." It is pronounced "air-MOH-sah" or "air-MOH-soh."
Try Bonita/Bonito. This generally is translated as "pretty." It is pronounced "bohn-EE-tah" or "bohn-EE-toh."
Say Linda/Lindo. This often also translates to "pretty." It is pronounced "LEEN-dah" or "LEEN-doh."
Use Preciosa/Precioso. This word most directly corresponds to the English word "precious." It is pronounced "pray-see-OH-sah" or "pray-see-OH-soh."
Try Guapa/Guapo. This equates to "good-looking." It is pronounced "GWA-pah" or "GWA-poh."