kosztowny ?:

1. expensive

American english word "kosztowny"(expensive) occurs in sets:

UNIT 1 Cutting Edge Pre-Intermediate Student's Book
AVIO 9_14th Nov. Adjectives
Marzena_1_12th July 2023
EF_Unit 3 PROBLEMS

2. costly

American english word "kosztowny"(costly) occurs in sets:

shopping and services