Definition
In the law of contracts, "sin" is an archaic shorthand term for simplex commendatio non obligat — the principle that mere praise or commendation of goods or property does not give rise to a binding legal obligation. A seller who extols the virtues of what they are selling without making a specific factual representation is not contractually bound by that praise. The term functions less as a standalone doctrine and more as a mnemonic for the maxim it abbreviates.
Under this principle, puffery — general boastful language about quality, value, or desirability — is legally inert. It does not constitute a warranty, a representation, or a term of the contract. Only specific, material statements of fact, not general laudatory language, can give rise to actionable claims.
Common Language
Modern common usage (Wiktionary): A letter of the Hebrew alphabet (שׂ) or the Arabic alphabet (س).
Historical common usage (Webster's 1913): An archaic or dialectal form of "since," found in Middle English poetry and Scots usage. "Sin that his lord was twenty year of age." — Chaucer.
The gap here is complete rather than partial. Neither the religious/moral sense of "sin" — wrongdoing against a divine or ethical code — nor the alphabetic or archaic grammatical senses have any connection to the legal term. A researcher encountering "sin" in a contracts treatise or maxim collection is reading a Latin abbreviation, not an English word. The risk of confusion is real precisely because the legal abbreviation looks like a common English word.
Common Confusion
The most significant trap is misreading "sin" in older legal texts as the English word for moral transgression. Canon law, ecclesiastical courts, and early equity materials use the vocabulary of sin in its moral sense, and the two usages can appear in proximity in historical sources. A researcher working in ecclesiastical jurisdiction materials or early equity should read context carefully: "sin" as moral wrong belongs to a different register entirely from "sin" as simplex commendatio non obligat. The abbreviation is a contracts-and-commercial-law term; the moral vocabulary belongs to ecclesiastical and early equity traditions.
Why It Matters in Research
This term is almost exclusively a historical artifact. Researchers are unlikely to encounter "sin" as a live doctrinal label in modern sources. Its significance is navigational: it signals that an older treatise, digest, or maxim collection is invoking the puffery principle via Latin abbreviation.
The underlying doctrine — that puffery does not bind — remains fully operative in modern contract and commercial law, including under the Uniform Commercial Code's treatment of express warranties. If a source uses "sin" in this sense, follow the thread to simplex commendatio non obligat and from there to the modern puffery doctrine.
Burrill is the primary corpus source for this term in its abbreviated legal form. Researchers should not expect to find "sin" used this way in American case law reporters, where the doctrine would be expressed through "puffery," "mere commendation," or the Latin maxim written out in full. The abbreviation is a dictionary and treatise convention, not a term of art used in judicial opinions.
Historical Dictionary Support
Burrill's Law Dictionary provides the only corpus entry for this term, and its definition is concise and functional: "In the law of contracts. Mere commendation or praise. Simplex commendatio non obligat. Mere commendation does not bind. 2 Kent's Com. 485." The citation to Kent's Commentaries anchors the principle in a major American authority and confirms this was treated as a recognized doctrine, not merely a civilian curiosity.
Burrill frames the entry as definitional rather than analytical — he records the maxim, glosses it, and moves on. No historical legal dictionary in the Law Mind corpus develops the doctrine beyond this. For substantive treatment of the puffery principle itself, Kent's Commentaries and secondary commercial law sources carry more weight than any dictionary entry.