wanting
1. [ adjective ] not existing
Synonyms: missing lacking nonexistent
Examples:

"innovation has been sadly lacking" "character development is missing from the book"

Related terms: absent
2. [ adjective ] inadequate in amount or degree
Synonyms: lacking deficient
Examples:

"a deficient education" "deficient in common sense" "lacking in stamina" "tested and found wanting"

Related terms: inadequate
Similar spelling:   wanton
  wantonly