Disagreeable means unpleasant, whether in a thing or a person. A disagreeable smell, a disagreeable man, disagreeable weather.
Applied to a thing it is a mild and rather formal way of saying nasty. Applied to a person it means difficult and unfriendly, which is heavier. In personality psychology, agreeableness is one of the five main traits, and disagreeable is its technical opposite — which makes the word both an insult and a measurement. Note disagreeably; and disagree, which is far commoner.
1adjectivedisagreeableUnpleasant.
“The medicine had a disagreeable taste, so I swallowed it quickly.”
2adjectivedifficultDifficult and unfriendly, of a person.
“The disagreeable old man complained about everything the nurses did.”
disagreeable is a quality of unpleasantness.
Old French desagreable is des- plus agreable, from a phrase meaning to please. Agree comes from the same root, which is Latin gratus, pleasing.
Old French
desagraable
Middle French
desagreable
Middle English
disagreable
English, today
disagreeable
Middle English disagreable, from Middle French desagreable, from Old French desagraable (compare French désagréable). by surface analysis, dis- + agreeable.
Etymology from Wiktionary, CC BY-SA
Practised in Word Building