in ‧ sub ‧ stan ‧ tial /ˌɪnsəbˈstænʃ ə l◂/ BrE AmE adjective
[ Word Family: noun : ↑ substance , ↑ substantiation , ↑ substantive ; adjective : ↑ substantial ≠ ↑ insubstantial , ↑ substantive ; verb : ↑ substantiate ; adverb : ↑ substantially ]
1 . formal not solid, large, strong, or definite:
The evidence seemed very insubstantial.
an insubstantial meal
the insubstantial outline of a ship
2 . literary not existing as a real object or person:
insubstantial ghosts