studied
Studied is the past tense and past participle of the verb study. It refers to the act of devoting time and attention to acquiring knowledge or skill, often through reading, investigation, or practice. In sentences, it marks actions completed in the past, as in "She studied chemistry for the exam," and it also forms perfect tenses such as "has studied" or "had studied." In passive constructions, the form appears as in "The material was studied by researchers."
Etymology and form: The English form is regular, with the -ed ending used to indicate past tense
Adjective use: Studied can function as an adjective describing something that is deliberately or deliberately rehearsed,
Related terms and usage: Related forms include study (noun and verb), studying (gerund and present participle),
In summary, studied denotes both a verb form indicating completed past action of learning and an adjective