Where does “kostyczny” come from?

kostyczny (Polish) comes from French caustique, from Latin causticus, from Ancient Greek καυστικός, from Ancient Greek -ικός, from Ancient Greek -κός, from Proto-Indo-European -ḱos — -y, -ic.

kostyczny (Polish): caustic, harsh, mean, scathing

Definitions

caustic, harsh, mean, scathing

Ancestry of “kostyczny”, step by step

Step	Language	Word	Meaning
1	French	caustique	caustic; scathing, biting, pungent
2	Latin	causticus	burning
3	Ancient Greek	καυστικός	burning
4	Ancient Greek	-ικός	of or pertaining to, in the manner of; -ic
5	Ancient Greek	-κός	forms adjectives with the sense of 'of or...
6	Proto-Indo-European	-ḱos	-y, -ic

Every word from Proto-Indo-European -ḱos →Every word from Ancient Greek -ικός →Every word from Ancient Greek -κός →