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Suffix · forms adjectives

-grounded

Describes how sensible or well-supported a person, idea, or theory is: well-grounded (sensible, level-headed) versus poorly-grounded (weakly supported).

In Spanish: fundamentado / arraigado / con los pies en la tierraLiterary

Written by Bryan López, English teacher · Updated August 2026

What this suffix does

-grounded forms compound adjectives with two connected meanings. The first is intellectual: well-grounded, firmly-grounded, soundly-grounded — describing a claim, argument, or position that is securely based in evidence, experience, or established knowledge. The second is psychological: a well-grounded person is one who is psychologically stable, secure in their sense of identity, and not easily destabilised by external events. Both uses share the root metaphor of having secure contact with the ground — the intellectual version means contact with reality and evidence; the psychological version means contact with one's own stable centre.

How it is formed

Adverb + grounded.

  • well + grounded
    well-grounded (sensible, level-headed)
  • firmly + grounded
    firmly-grounded (solidly based)
  • poorly + grounded
    poorly-grounded (weakly supported)

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.

How it is pronounced

-grounded

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

Examples

Base word
With -grounded
In a phrase
  • wellwell-groundedHe's a well-grounded person, success hasn't changed him.
  • firmlyfirmly-groundedHer decision is firmly-grounded in years of experience.
  • deeplydeeply-groundedTheir values are deeply-grounded in family traditions.
  • poorlypoorly-groundedThe theory is poorly-grounded and hard to defend.
  • solidlysolidly-groundedThe company's growth is solidly-grounded in real demand.

Common mistakes

"well-grounded" and "well-founded" mean exactly the same thing
"well-grounded" emphasises the connection to a base (evidence, experience, or psychological stability); "well-founded" emphasises the quality of the foundation itself

"Well-grounded" and "well-founded" overlap significantly but have distinct emphases. "Well-grounded" tends to emphasise the connection to something real — the grounding in evidence, experience, or practice. "Well-founded" tends to emphasise the quality and strength of the foundation — how well-built the basis is. A claim can be well-founded on a single compelling piece of evidence; a position is well-grounded when it has been developed through sustained contact with the relevant reality.

"well-grounded" = stable and calm (only psychological meaning)
"well-grounded" has both an intellectual meaning (based in evidence or experience) and a psychological meaning (stable and secure in one's identity)

In modern usage "well-grounded" is used in both intellectual contexts (a well-grounded argument, a well-grounded theory) and psychological or spiritual contexts (a well-grounded person, a well-grounded response to difficulty). The two uses share the same core metaphor of secure contact with what is real and solid.

A trick to remember it

The metaphor of grounding is one of the most productive in English for describing both intellectual and psychological quality. Something is grounded when it has secure contact with what is real — evidence in the intellectual case, one's stable identity in the psychological case. "Well-grounded" therefore describes a quality that cannot be faked or performed: you are either grounded in the evidence or you are not; you are either psychologically grounded or you are not. The compound describes a relationship of secure contact, not a performance of confidence.

Practise what you learned

Exercise 1 · Form the word

Fill in: "The ___ recommendation was backed by twelve years of outcome data, which made it almost impossible to reject on principled grounds." (having a secure foundation in evidence; based on solid contact with relevant reality)

Hint: Well + grounded = having secure contact with the ground of evidence or experience.

Exercise 2 · Pick the right one

"She was the most well-grounded person in the room — nothing that was said seemed to unsettle her sense of who she was." What does "well-grounded" mean here?

Exercise 3 · Form the word

Fill in: "The ___ theory broke down as soon as it was tested against the actual data from the field study." (having an inadequate or weak connection to evidence or reality)

Hint: Poorly + grounded = with an inadequate or insufficient connection to the ground of evidence or reality.

Frequently asked questions

What does the suffix -grounded mean in English?

The suffix -grounded describes how sensible or well-supported a person, idea, or theory is: well-grounded (sensible, level-headed) versus poorly-grounded (weakly supported). In Spanish it usually maps to fundamentado / arraigado / con los pies en la tierra.

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

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

Other useful suffixes

  • -founded

    Judges how solid the basis of a claim or fear is: well-founded (justified, based on good evidence) versus ill-founded (baseless).

  • -reasoned

    Judges how solid an argument's logic is: well-reasoned (logically sound) versus poorly-reasoned (weak logic).

  • -rooted

    Describes how deeply embedded something is: deep-rooted (firmly established) versus shallow-rooted (not well established).

Learn every English suffix

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

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