If “were tired” is correct grammatically, why is “was studied” not? [closed]

Both words may be used as adjectives. I was tired describes me as being tired (by work, exercise, boredom, etc). I was studied describes me as being studied (by a doctor, a psychologist, an anthropologist etc).

I was studied English makes no sense because studied is used as a verb and the verbal noun phrase “studied English” is meaninglessly adjectival when applied to “I”.

“Studied English” might be used as a noun phrase in a sentence such as “The author used studied English to express herself, rather than using colloquial English”