gainsayer

listen to the pronunciation of gainsayer
English - English
A person who gainsays others; a disagreeable person

This urge to ensure the continued viability of UK science is balanced by warnings that such a system brings closer the day when computers will take over the running of the world and discard humanity. One such gainsayer is Bill Joy, inventor of the web language Java and chief scientist at computer giant Sun Microsystems.

{n} an opponent, adversary, denier
One who gainsays, contradicts, or denies
{i} person who contradicts; person who denies
Someone who manipulates for personal interests
gainsay
To contradict; to deny, refute; to controvert; to dispute; to forbid

Know then that in the time of the Great Rebellion (the history of which by the learned Lord Clarendon I most earnestly commend to your attention) this Manor of Baskerville was held by Hugo of that name, nor can it be gainsaid that he was a most wild, profane, and godless man.

gainsay
{v} to contradict, oppose, thwart, deny
gainsay
{i} denial; refusal; objection
gainsay
If there is no gainsaying something, it is true or obvious and everyone would agree with it. There is no gainsaying the fact that they have been responsible for a truly great building. = deny. to say that something is not true, or to disagree with someone = contradict (gain- (13-16 centuries) (from gegn) + say)
gainsay
{f} deny; dispute, contradict
gainsay
take exception to; "She challenged his claims"
gainsay
To contradict; to deny; to controvert; to dispute; to forbid
gainsayer
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