calculate — If you calculate a number or amount, you discover it from information that you already have, by using arithmetic, mathematics, or a special machine.
disregard — to pay no attention to; leave out of consideration; ignore: Disregard the footnotes.
hesitate — to be reluctant or wait to act because of fear, indecision, or disinclination: She hesitated to take the job.
ignore — to refrain from noticing or recognizing: to ignore insulting remarks.
disbelieve — to have no belief in; refuse or reject belief in: to disbelieve reports of UFO sightings.
estimate — Roughly calculate or judge the value, number, quantity, or extent of.
forget — to cease or fail to remember; be unable to recall: to forget someone's name.
guess — to arrive at or commit oneself to an opinion about (something) without having sufficient evidence to support the opinion fully: to guess a person's weight.
know — to perceive or understand as fact or truth; to apprehend clearly and with certainty: I know the situation fully.
measure — a unit or standard of measurement: weights and measures.
neglect — to pay no attention or too little attention to; disregard or slight: The public neglected his genius for many years.
noun estimate
cost — The cost of something is the amount of money that is needed in order to buy, do, or make it.
ignorance — the state or fact of being ignorant; lack of knowledge, learning, information, etc.
