What does the word "Refractory" mean?

• The word "Refractory" means - Stubborn and resistant.

• Refractory (adjective)
English Meaning: Difficult to control; unwilling to obey.
Bangla Meaning:
(১) একগুঁয়ে; অবাধ্য: as refractory as a mule; (রোগব্যাধি) দুশ্চিকিৎস্য; দুরারোগ্য।
(২) (পদার্থ, বিশেষত ধাতু) গলানো বা শিল্পের উপকরণরূপে ব্যবহার করতে দুরূহ এমন; দুর্গল; অবশ্য।

Example Sentence:
1. A refractory child is very hard to control.
2. The patient died of refractory heart failure one month later.

3. The patient was given multiple antibiotics, but his refractory infection remained resistant to treatment.
4. The manager struggled to handle the refractory employees who refused to follow company policies.

Source:
1. Cambridge Dictionary.
2. Accessible Dictionary by Bangla Academy.