the feeling that something exists or is true, that a person is honest, will be successful etc

putting regard in as true

to form an opinion, give an answer, make a statement about (something) that is not based on very careful thought, calculation or definite knowledge

belief, speculation

an idea, suggestion, put forward as a starting-point for reasoning or an explanation

theory

a belief or judgement not based on complete knowledge

belief

a preconceived idea, opinion

idea formed before event occurs or facts are received

a statement on which an opinion, argument, reason etc is based

hypothesis, argument

something which seems likely although there is no proof; arrogance (the usual word)

belief, hypothesis

the act of supposing something to be true but without proof; a guess

guess, belief

a long, detailed piece of writing explaining, supporting or criticizing something, especially as part of an academic course

belief, assumption to be tested