septuagenary

[sep-choo-aj-uh-ner-ee, -too-, -tyoo- or, especially Brit., -choo-uh-jee-nuh-ree]

adjective, noun, plural sep·tu·ag·e·nar·ies.

Origin:
1595–1605; < Latin septuāgēnārius, equivalent to septuāgēn(ī) seventy each (distributive of septuāgintā seventy) + -ārius -ary

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Septuagenary has a plethora of syllables.

So is cyclotrimethylenetrinitramine. Does it mean:

a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.

the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).

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sep·tu·ag·e·nar·y