Substantial
Part of speech: adjective
Definition: Belonging to substance; actually existing; real; as, substantial life. Not seeming or imaginary; not illusive; real; solid; true; veritable. Corporeal; material; firm. Having good substance; strong; stout; solid; firm; as, substantial cloth; a substantial fence or wall. Possessed of goods or an estate; moderately wealthy; responsible; as, a substantial freeholder. Large in size, quantity, or value; as, a substantial amount of money; vast Most important; essential. Ample or full. Significantly great.
Example sentence: Breakfast is the most important meal of the day. When you feed yourself what your body needs when it needs it, that's love. So give your bod some TLC and sit down and enjoy a good, substantial breakfast.
Considerable
Part of speech: adjective
Definition: Significant; worth considering.Large in amount.
Example sentence: Although I liked especially physics and mathematics for which I had considerable talent, I decided to study medicine. This profession had for me a strong emotional appeal, which was reinforced by having an uncle who was an excellent surgeon.