nuncau lujvo

x1 is the state of x2's lack of x3; x1 is the event/situation in which x2 lacks x3; x1 is the state/event of x3's absence (being absent from) x2.

See also: "nalzva" (which refers to being physically not located somewhere specified; "nuncau" is somewhat more general).

In notes:

x1=n1 is a lexical gap, the lack of a word meaning/causing x2=v2 in language/[lexicon] x3=v3.