SpeakUP Academy
Descubre tu nivel
HomeSuffixes-defined
ESEN

Suffix · forms adjectives

-defined

specified, delimited, or given precise meaning in a specified manner; evaluating the clarity and precision of boundaries, terms, or scope

In Spanish: definido / delimitado / con límites clarosLiterary

Written by Bryan López, English teacher · Updated June 2026

What this suffix does

-defined forms compound adjectives that evaluate the clarity, precision, and adequacy of definition — whether of concepts, boundaries, roles, or scope. Well-defined, ill-defined, sharply-defined, clearly-defined, loosely-defined, narrowly-defined — each compound judges how precisely something has been given its limits and meaning. In academic writing, legal drafting, and policy analysis, poorly-defined terms and ill-defined scope are among the primary sources of confusion and dispute. "Well-defined" therefore carries significant intellectual weight.

How it is pronounced

-defined

Tap the button to hear how the ending sounds. Each word in the table has its own audio.

Examples

Base word
With -defined
In a phrase
  • wellwell-definedThe well-defined mandate gave the inspector general authority to investigate any transaction above a specified value, without exception.
  • illill-definedThe ill-defined boundaries between the two departments had produced five years of duplicated effort and territorial conflict.
  • sharplysharply-definedThe sharply-defined edge of the cliff formed a visual boundary between the inhabited valley and the open moorland above.
  • looselyloosely-definedThe loosely-defined term "wellness" was used in the industry to mean anything the marketing department found convenient.
  • narrowlynarrowly-definedThe narrowly-defined scope of the inquiry prevented it from addressing the broader pattern of which each incident was a part.

Common mistakes

well-defined = simple, straightforward, or uncomplicated
well-defined = precisely specified with clear limits, whatever its complexity

"Well-defined" describes precision of specification, not simplicity of subject. A very complex legal concept can be well-defined — precisely delimited with clear boundaries even if the subject itself is intricate. A simple concept can be ill-defined — imprecisely specified despite its apparent simplicity. The compound judges the quality of the definition, not the complexity of what is defined.

"ill-defined" = vague or unclear (only describes concepts and terms)
"ill-defined" applies to anything that needs precise limits: boundaries, roles, responsibilities, mandates, scope

"Ill-defined" can describe not just concepts and terms but physical boundaries (an ill-defined coastline), roles and responsibilities (ill-defined authority), the scope of a project or inquiry (ill-defined mandate), and any other thing whose precision of specification can be evaluated. The compound is wider than its most common use in conceptual contexts.

A trick to remember it

"Ill-defined" is one of the most powerful critical tools available in academic, legal, and policy writing — and one of the most common sources of real-world problems. An ill-defined term in a contract creates years of litigation; an ill-defined role creates perpetual territorial conflict; an ill-defined scope creates an inquiry that either misses the problem or exceeds its authority. Identifying what is ill-defined is often the first step in fixing what is wrong with a system.

Practise what you learned

Exercise 1 · Form the word

Fill in: "The ___ criteria for promotion meant that decisions could be made on any basis the manager chose." (imprecisely specified; without clear limits that would constrain interpretation)

Hint: Ill + defined = defined badly; without the precision needed to constrain interpretation or application.

Exercise 2 · Pick the right one

"The sharply-defined boundary between permitted and prohibited activity left no room for interpretation." What does "sharply-defined" tell us about the boundary?

Exercise 3 · Form the word

Fill in: "The ___ mandate allowed the commission to do what was needed without wasting resources on jurisdiction disputes." (specified with precision and clarity; with limits clear enough to guide action without ambiguity)

Hint: Well + defined = specified with adequate precision; with limits clear enough to be functional.

Frequently asked questions

What does the suffix -defined mean in English?

The suffix -defined specified, delimited, or given precise meaning in a specified manner; evaluating the clarity and precision of boundaries, terms, or scope In Spanish it usually maps to definido / delimitado / con límites claros.

Can you give an example of a word with -defined?

"well" becomes "well-defined". It is a typical example of the -defined suffix.

Other useful suffixes

  • -founded

    based or established on a specified type or quality of foundation; describing the logical or evidential basis of a claim, belief, or concern

  • -placed

    positioned or situated in a specified location or manner; describing the quality of positioning, placement, or strategic location

  • -reasoned

    argued or supported by a specified quality of reasoning; evaluating the logical quality of an argument or position

Learn every English suffix

-tion, -ness, -ful, -ly, -able... every ending you need to understand thousands of words at once.

View all suffixes
SpeakUP Academy

Aprende

  • Lecciones gratis
  • Test de nivel
  • Glosario
  • Falsos amigos

SpeakUP

  • Nosotros
  • Iniciar sesión

Legal

  • Términos
  • Privacidad
© 2026 SpeakUP Academy. Todos los derechos reservados.