prone

definition: 
likely to do something
sentence: 
Passive smoking affects non-smokers and makes them more prone to respiratory infections.
The link between adrenalin making people more prone to heart failure is not well established.
Most liquids are prone to contract when frozen
He is prone to study hard the night before the test
difficulty: 
easy
toefl frequency: 
3
toefl classification: 
adverb: 
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