고학력이 · 고학력을
high level of education, highly educated
Example
고학력 실업자가 점점 늘고 있습니다.
The number of unemployed people with advanced degrees is steadily rising.
Word parts
고 high+학 study+력 record
Literally 'high study record'; 학력 here means educational background, not ability.
Good to know
Pronounced [고항녁] — nasalization.