vow -
a solemn pledge (to oneself or to another or to a deity) to do something or to behave in a certain manner; "they took vows of poverty"
assurance,
pledge freedom from doubt; belief in yourself and your abilities; "his assurance in his superiority did not make him popular"; "after that failure he lost his confidence"; "she spoke with authority"
Verb
vow -
make a vow; promise; "He vowed never to drink alcohol again"
plight,
pledge promise solemnly and formally; "I pledge that I will honor my wife"
profess state insincerely; "He professed innocence but later admitted his guilt"; "She pretended not to have known the suicide bomber"; "She pretends to be an expert on wine"
