the.com/doubtful

The thinker's bodyguard, frisking every certainty before it walks through the door.

means Feeling or expressing uncertainty, or describing something whose truth or outcome can't be relied upon.

from From the verb 'doubt,' which English borrowed in the medieval period from Old French 'douter,' itself descended from Latin 'dubitare' — to waver, to hesitate between two choices. That 'du-' carries an old echo of 'two' (as in Latin 'duo'), the mind torn between a pair of possibilities. The silent 'b' is a later scholarly affectation, slipped back into the spelling to honor the Latin ancestor, even though English speakers had long stopped pronouncing it. The '-ful' suffix simply means 'full of' — so 'doubtful' is, quite literally, brimming with doubt.

latin root
From dubitare, meaning to waver between two things
science engine
Doubt fuels every experiment ever attempted
descartes
He doubted everything except the doubting itself
two-faced word
Linked to double, hence wavering between two minds
for instance

thomas the train existence — rev. awdrey created the character in 1942, yet fans debate if thomas was truly based on a real engine

shroud of turin authenticity — radiocarbon dating in 1988 suggested medieval origin, but believers contest the results

bigfoot sightings — thousands of reported encounters in the pacific northwest since the 1950s, no conclusive physical evidence

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