Definition
In Roman civil law, to disapprove or disallow a thing, act, or claim formally. The term functions as the direct antonym of *approbare* (to approve or confirm). Used in procedural and substantive civil law contexts to denote the act of rejecting or refusing to sanction something — a judgment, a testament, a pleading, or conduct — by a competent authority.
Why It Matters in Research
This is a Latin term of art appearing almost exclusively in civil law sources and in English legal works drawing on Roman law foundations. Researchers will encounter it primarily in texts organized around Roman-derived legal taxonomy, where paired opposites (approbare/improbare, alienare/retinere, etc.) structure the exposition of legal concepts. Because the term has no direct common-law English equivalent that survived into modern usage, it tends to disappear from Anglo-American legal writing after the early nineteenth century.
When searching historical legal dictionaries or digests, note that *improbare* may appear in discussions of testamentary law (disapproving a will), procedural law (disallowing a pleading or exception), or censorial and magisterial authority in Roman public law. The term is sparse in English-language legal literature and likely signals either a civil law–trained author or a work in the learned law tradition drawing directly on continental sources.
Researchers using the Law Mind corpus should treat *improbare* as a pointer term: its presence in a document is a strong signal that the surrounding text is engaging with Roman or civil law doctrine rather than common law authority. Cross-reference against *approbare* to understand the full binary the author is employing.
Historical Dictionary Support
Burrill's Law Dictionary provides the core entry: "to disapprove; to disallow; the opposite of approbare," citing Calvinus's *Lexicon Juridicum* as authority. This is a minimal but accurate entry. Burrill does not extend the definition into specific procedural contexts or give examples from Roman sources, which limits its utility for researchers wanting to understand exactly where and how the term operated in classical or later civil law practice.
Calvinus (*Lexicon Juridicum Juris Caesarei Simul et Canonici*, various editions from the late sixteenth century onward) is the standard reference work Burrill points to for Latin civil law terminology, and its entry for *improbare* would be the appropriate next stop for researchers needing the term situated within its original doctrinal context.
No English common law dictionaries of the major period — Cowell, Rastell, Blount, Jacob, Tomlin — are known to carry substantive entries for *improbare*, which reflects its limited penetration into English common law vocabulary. Its absence from those sources is itself informative.