거의(geo-ui, geoui)
Indicates that a state or degree is almost complete or nearly reached.
When to use
almost finished task, nearly ended time, almost impossible situation
The nuance
Use 거의 when quantity, time, or degree is close to 90% or more; often used with negative sentences.
대체로(dae-che-ro, daechero)
Expresses a general tendency or average state when looking at the whole picture.
When to use
generally correct opinion, generally good weather, generally successful result
The nuance
Use 대체로 to describe an overall trend or tendency, allowing for some exceptions.
웬만큼(wen-man-keum, wenmankeum)
Indicates a certain sufficient level, meeting expectations or being adequate.
When to use
student who studied adequately, food that is reasonably tasty, skill that is fairly good
The nuance
Use 웬만큼 to express meeting or exceeding an expected standard; it has a positive nuance.