Noun
One who observes, or pays attention to, anything; especially, one engaged in, or trained to habits of, close and exact observation; as, an astronomical observer.
One who keeps any law, custom, regulation, rite, etc.; one who conforms to anything in practice.
One who fulfills or performs; as, an observer of his promises.
A sycophantic follower.
Source: Webster's dictionaryIf some really acute observer made as much of egotism as Freud has made of sex, people would forget a good deal about sex and find the explanation for everything in egotism. Wallace Stevens
A person who is too nice an observer of the business of the crowd, like one who is too curious in observing the labor of bees, will often be stung for his curiosity. Alexander Pope
A husband without faults is a dangerous observer. George Savile, 1st Marquess of Halifax
None can be an impartial or wise observer of human life but from the vantage ground of what we should call voluntary poverty. Henry David Thoreau
The philosophical anthropologist ... can know the wholeness of the person and through it the wholeness of man only when he does not leave his subjectivity out and does not remain an untouched observer. Martin Buber
The material presence of the work only serves as a conveyer launching an invitation to the observer to take part of the comprehensive game of the thousand and one emotions and visions. Antoni Tàpies