Most instanced can be described as a term that denotes the highest or greatest number of occurrences. Antonyms for this term would therefore be words that indicate an absence, lack, or scarcity of something. Words such as least frequent, seldom, rare, sporadic, and occasional can be considered antonyms for most instanced. These terms suggest a lower frequency or few occurrences of an event, idea, or occurrence. Antonyms for most instanced can also include phrases such as uncommon, infrequent, atypical, and uncharacteristic. These words are used to describe events or situations that occur rarely, deviating from the norm or usual patterns.