[adj] fairly large; "won by a substantial margin"
[adj] having substance or capable of being treated as fact; not imaginary; "the substantial world"; "a mere dream, neither substantial nor practical"; "most ponderous and substantial things"- Shakespeare
[adj] being the essence or essential element of a thing; "substantial equivalents"; "substantive information"
[adj] providing abundant nourishment; "a hearty meal"; "good solid food"; "ate a substantial breakfast"
[adj] of good quality and condition; solidly built; "a solid foundation"; "several substantial timber buildings"
considerable, essential, hearty, in essence, material, real, satisfying, significant, solid, sound, strong, substantive, wholesome