
rosa
pink
The color that is a mixture of red and white; pink.
Sie trug ein rosa Kleid zur Party.
She wore a pink dress to the party.
pink
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pink
The color that is a mixture of red and white; pink.
Sie trug ein rosa Kleid zur Party.
She wore a pink dress to the party.

rosy
Figuratively, an overly optimistic or glossed-over point of view. Often in the expression 'etwas durch die rosa Brille sehen' (to see something through rose-colored glasses).
Nach dem ersten Erfolg sieht er die Zukunft des Projekts vielleicht etwas zu rosa.
After the first success, he may be seeing the future of the project a bit too rosily.
'Rosa' (pink) is a special adjective: it is not declined. It always keeps the form 'rosa', no matter what gender, case, or number the noun has. This is a common source of errors.
Ich suche einen rosa Pullover.
I'm looking for a pink sweater.
The figurative meaning of 'rosa' (rosy) is used almost exclusively in the idiom 'etwas durch die rosa Brille sehen' (to see something through rose-colored glasses). This means judging a situation too optimistically and unrealistically positively.
Er ist frisch verliebt und sieht die ganze Welt nur noch durch die rosa Brille.
He's newly in love and now sees the whole world through rose-colored glasses.
As a color, 'rosa' (pink) is often associated with things that are stereotypically considered sweet, delicate, or feminine. Typical nouns are 'rosa Schwein' (pink pig), 'rosa Wolken' (pink clouds), or 'rosa Bonbon' (pink candy).
Am Abendhimmel waren wunderschöne rosa Wolken zu sehen.
Beautiful pink clouds could be seen in the evening sky.
pink
Rosa and pink both refer to light mixtures of red and white, and in everyday use they can overlap. Rosa usually sounds paler or more delicate, while pink often refers to a stronger, brighter shade. Choose rosa for a soft shade and pink for greater vividness.

Das Mädchen trägt heute ein rosa T-Shirt in einem zarten Farbton.
The girl is wearing a pale pink T-shirt today.
Das Mädchen trägt heute ein pinkes T-Shirt in einem kräftig leuchtenden Farbton.
The girl is wearing a bright pink T-shirt today.