adiaphorous

[ad-ee-af-er-uhs]

ad·i·aph·o·rous

[ad-ee-af-er-uhs]
adjective
doing neither good nor harm, as a medicine.

Origin:
1625–35, for earlier sense; < Greek adiáphoros, equivalent to a- a-6 + diáphoros different (dia- dia- + -phoros -phorous)
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Adiaphorous has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
Collins
World English Dictionary
adiaphorous (ˌædɪˈæfərəs)
 
adj
med having no effect for good or ill, as a drug or placebo
 
[C17: from Greek adiaphoros indifferent, from a-1 + diaphoros different]

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