Sihhah

Sihhah names an act or contract that met every pillar and condition required, so its intended legal effect applies in full.

What it means for me: Sihhah tells you an act or contract produced its intended legal effect. It says nothing on its own about whether the person involved acted honestly or with care.

Example: Someone asks about a past sale. The answer says the contract is sahih, meaning ownership transferred and its effects apply. That is a separate question from whether the seller was fair to the buyer.

Do not confuse with: Sahih, the hadith grading. Sihhah describes an act or contract meeting its requirements. Sahih, in hadith, describes a chain of narrators judged reliable: related words, different subjects.

If scholars differ: The majority use a two-way division: an act or contract is either sihhah or batil, void. The Hanafi school adds a third category in transactions, fasid, for a sound act carrying one defective condition. This is explored further in why you should learn a contract's ruling before you sign it.