deep

definition: 
far below surface; complete understanding
sentence: 
She would take a deep, shuddering breath and let it out in a sigh.
difficulty: 
very easy
toefl frequency: 
3
toefl classification: 
adverb: 
deeply
adjective: 
deep
adverb sentence: 
adjective sentence: 
verb: 
verb sentence: 
noun: 
depth
noun sentence: 
The depth of his understanding of math is remarkable.