Important, considerable, rich, tangible, significant, sturdy, filling, substantive, material
a) large in amount or degree
- They have made substantial improvement in providing basic facilities.
- There are substantial differences between the two theories.
- He has at least four substantial meals every day.
- There has been a substantial increase in the number of road accidents in the last two years.
b) wealthy; a large amount of money
- He has made substantial savings over the years.
- If we can’t raise a substantial sum, we will be in real trouble.
c) large and strongly built
- It was a substantial brick building that could withstand even strong earthquakes.
d) important, or real
- The trade union leader’s decision to boycott the meeting was not based on anything substantial.
- He is one of the most substantial philanthropists in the country.
e) making you feel full and satisfied
- Studies have proved that a substantial breakfast may actually reduce food cravings and help people lose weight.
Substance (noun): material
- Iron is a hard substance.
To substantiate is to confirm or prove that something is true or valid
- These evidences substantiate the solicitor’s claim that his client is not guilty.