The Power of Genuine Warmth and Approachability

Which word is the opposite of approachable?
Which word is similar to showy?
What is the name for a group in an experiment that receives the treatment?
What is the name for a line that best fits the data points in a scatter plot?
What is the name for a measure that describes a characteristic of the sample?
Which word is similar to Unaccountable?
________________ are formed when water vapor in the air is cooled and condenses.