considerable
adj.adj. large in size, amount, or importance. You use this to describe something that is big enough to be noticed or to have a real effect.
adj. notably large in size, amount, or extent; significant. Frequently used in academic or formal contexts to quantify an impact or volume without providing exact figures.
The project required a considerable amount of time and effort.
After the new law passed, the company saw a considerable increase in its annual operating costs.
Despite considerable opposition from local residents, the city council approved the construction of the high-rise apartment complex in the historic district.
From consider + -able.
Typically precedes the noun it modifies; often collocates with abstract nouns like 'amount', 'effort', 'influence', or 'interest'.