vast

definition: 
Situated so as to catch the attention; noticeable:
sentence: 
I have noticed a vast improvement in your English vocabulary.
difficulty: 
very easy
toefl frequency: 
3
toefl classification: 
adverb: 
adjective: 
adverb sentence: 
The air quality has deteriorated vastly over the past 10 years
adjective sentence: 
verb: 
vastly
verb sentence: 
noun: 
noun sentence: