Longman Dictionary of Contemporary English homepage

insubstantial

adjective
     
in‧sub‧stan‧tial
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

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