Bound vs. Bounded
The choice between “bound” and “bounded” depends on which verb you mean. “Bound” is the past and past participle of “bind,” while “bounded” belongs to the separate verb “bound” in senses such as moving by leaps or forming a boundary.
“Bound” and “bounded” usually belong to different verb paradigms: “bound” is the past of “bind,” while “bounded” is the past/participle of the separate verb “bound” when it means jump or form a limit.
Key details
Choose the right form
| Meaning / situation | Construction | Decision |
|---|---|---|
| past of bind: tied, obliged, constrained | bound | use the bind paradigm |
| past/participle of bound: jumped or formed a boundary | bounded | use the separate verb “bound” |
Quick tests
Verb-identity test
Is the base verb “bind,” or the separate verb “bound”?
If yes: For “bind,” the past form is “bound.”
If no: For “bound” meaning jump or delimit, use “bounded.”
Caveat: Choose by the underlying verb and meaning, not by a simple regular/irregular spelling rule.
Examples
The agreement bound both parties.
“Bound” is the past of “bind.”
The dog bounded across the yard.
“Bounded” is the past of “bound” meaning jump.
The property is bounded by a stone wall.
“Bounded” is the participle of “bound” meaning form a boundary.
Further guidance
Core difference
Use “bound” for the past of “bind.” Use “bounded” for the past or participle of the separate verb “bound” meaning to jump or to form a boundary.
Fast Test
Ask which base verb fits: if the present-tense verb is “bind,” the past form is “bound”; if the present-tense verb is “bound” (jump/limit), the past form is “bounded.”
Lexical Boundary
Do not choose by tense alone. First identify whether the base verb is “bind” or the separate verb “bound.”
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- BOUND — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Direct dictionary evidence distinguishing bound as the past of bind from bounded as the past/participle of the separate verb bound