Meanings

unthinkable

thoughtful

prejudiced opinion

on second thought

reference book (work)

background research

exam study guide

criterion (criteria) for selection

selection committee

notes

study reference

overthinking

to think too much

uniformity of thought

a flexible way of thinking

rigid (stereotypical) thinking that adheres to preconceived notions

merit (ability, efficiency) rating

to be at a loss

midterm examination

groupthink