All necessitate antonyms

verb necessitate

• cheque — A cheque is a printed form on which you write an amount of money and who it is to be paid to. Your bank then pays the money to that person from your account.
• dissuade — to deter by advice or persuasion; persuade not to do something (often followed by from): She dissuaded him from leaving home.
• disallow — to refuse to allow; reject; veto: to disallow a claim for compensation.
• refuse — to decline to accept (something offered): to refuse an award.
• delay — If you delay doing something, you do not do it immediately or at the planned or expected time, but you leave it until later.
• repress — to keep under control, check, or suppress (desires, feelings, actions, tears, etc.).
• reply — followup
• discourage — to deprive of courage, hope, or confidence; dishearten; dispirit.
• halt — to falter, as in speech, reasoning, etc.; be hesitant; stumble.
• stop — to cease from, leave off, or discontinue: to stop running.
• 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.
• lose — to come to be without (something in one's possession or care), through accident, theft, etc., so that there is little or no prospect of recovery: I'm sure I've merely misplaced my hat, not lost it.
• fail — to fall short of success or achievement in something expected, attempted, desired, or approved: The experiment failed because of poor planning.
• check — Check is also a noun.
• give — to present voluntarily and without expecting compensation; bestow: to give a birthday present to someone.
• offer — to present for acceptance or rejection; proffer: He offered me a cigarette.