inessive adjective 1noun 1forms 1 adjective1 •Of or relating to the inessive case, a grammatical case that in some languages indicates the state of being in or inside a location.Their objects are partitive except in Finnish, where there is one accusative object of an inessive infinitive and two of adessive infinitives. — 2015 noun1 •The inessive case, or a word in that case. formsinessives