What this suffix does
-mannered describes someone's manners: well-mannered, ill-mannered. "mild-mannered" = gentle, mild in manner.

Suffix · forms adjectives
Describes someone's manners or conduct: well-mannered (polite) versus ill-mannered (rude).
Written by Bryan López, English teacher · Updated
-mannered describes someone's manners: well-mannered, ill-mannered. "mild-mannered" = gentle, mild in manner.
Adverb + mannered.
This is not a productive rule you can apply freely: it is a closed set of fixed expressions. Learn them one by one as set phrases.
-mannered
Tap the button to hear how the ending sounds. Each word in the table has its own audio.
"Well-mannered" describes observable outward behaviour — the specific acts of courtesy and social consideration. "Well-bred" implies a background and upbringing that produced those manners as a natural result. You can train someone to be well-mannered; being well-bred implies the manners emerged from formation. In everyday use they often overlap, but in careful use "well-bred" carries significantly more social weight.
"Mild-mannered" describes a quality of social interaction that is gentle, calm, and unassuming. It does not imply weakness, timidity, or lack of confidence. A mild-mannered person simply does not impose themselves loudly, roughly, or aggressively on others. The archetype is the mild-mannered superhero: Clark Kent is mild-mannered but is very far from weak.
A trick to remember it
well-mannered = "has good manners", from "manner" (the same word as in "table manners"). Nothing new: well/badly + manners.
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"mild-mannered" describes someone who is...
The suffix -mannered describes someone's manners or conduct: well-mannered (polite) versus ill-mannered (rude). In Spanish it usually maps to de modales / de trato.
"well" becomes "well-mannered". It is a typical example of the -mannered suffix.
Describes how a person, animal, or talent was raised: well-bred (well-mannered) versus ill-bred (badly raised).
Describes someone's underlying character: good-natured (kind, easygoing) versus ill-natured (bad-tempered).
Describes someone's tone or style of speaking: soft-spoken (speaking gently) and outspoken (speaking one's mind bluntly).
-tion, -ness, -ful, -ly, -able... every ending you need to understand thousands of words at once.