Similar words
lecker
lecker and köstlich are close synonyms for "tasty, delicious"; köstlich is slightly more elevated or formal.
Similar in other languages
French
délicieux
délicieux is the French word for the same thing — both mean "delicious."
Portuguese
delicioso
delicioso is the Portuguese word for the same thing — both mean "delicious."
Practice
1 What does köstlich mean?
delicious
2 Fill the gap: Der Kuchen war ___.
Full sentence: Der Kuchen war köstlich. (The cake was delicious.)
3 Which fingerprint chart matches köstlich?
köstlich: neutral register, common frequency, general domain, neutral connotation.