Term: a real stubborn streak

a real stubborn streak (noun phrase): a specific, noticeable part of someone’s character that makes them very determined to do what they want and refuse to do anything else. 

synonyms: obstinacy, inflexibility, bullheadedness, persistence. 

pronunciation: /ə rɪəl ˈstʌbən striːk/ 

translation: īsts spīta gars, spītības dzīsla 

example: He is generally very easy to work with, but he has a real stubborn streak when it comes to how the budget is spent. 

other words from this root: stubborn (adjective), stubbornly (adverb), streak (noun).

Understanding the “Streak”

In this context, a streak refers to a specific quality in someone’s personality that is not always visible but appears strongly in certain situations. It is like a “vein” of a particular behavior within their overall character.