muy
You would say "una persona muy agradable".
To say 'I have a microwave' in Spanish, you would say 'Tengo una microonda.'
To say 'I have a notebook' in Spanish, you would say 'Tengo un cuaderno.'
No muy buena is the best way to say "not very good" in Spanish.
To say 'rich' in Spanish, you would say 'rico.'
To say 'condensation' in Spanish, you would say 'condensación.'
To say 'evaporation' in Spanish, you would say 'evaporación.'
To say 'decompostion' in Spanish, you would say 'descomposición.'
To say 'knives' in Spanish, you would say 'cuchillos.'
Say "Muy delicioso!" (Very dilicious.)
Very similar in spanish: Mascota
If you'd like to tell someone to cheer up in Spanish you would say alegrarse. This is a very nice way to brighten someone's day.