Open English Wordnet
Adjectives
(s)substantial, substantiveof or relating to the real nature or essential elements of something“a substantial argument”
(a)substantial, real, materialhaving substance or capable of being treated as fact; not imaginary“the substantial world”, “a mere dream, neither substantial nor practical”, “The wind was violent and felt substantial enough to lean against”
(s)hearty, satisfying, solid, square, substantialproviding abundant nourishment“a hearty meal”, “good solid food”, “ate a substantial breakfast”, “four square meals a day”
(s)solid, strong, substantialof good quality and condition; solidly built“a solid foundation”, “several substantial timber buildings”