A gentleman's agreement is an unspoken agreement between parties that is typically based on trust, honor, and verbal assurances rather than formal or written contracts. Synonyms for this term include handshake deal, informal agreement, unwritten accord, verbal agreement, and pact of honor. The underlying principle of these agreements is that they are only as reliable as the integrity of the parties involved. This term is commonly used to describe deals between influential individuals or entities in politics or business, and they may involve promises or compromises that are not legally binding. While gentleman's agreements may be effective in promoting cooperation and achieving mutual goals, they can also be fragile and subject to mistrust and misunderstandings.