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adventitious
adjective
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How to pronounce adventitious:

Definition of adventitious:

adventitious (adjective):
added or appearing accidentally
coming from another source and not inherent or innate
adjective. associated by chance and not an integral part.

Synonyms for adventitious:

unnecessarychanceextraneousaccidentalalienirrelevantextrinsicforeignunexpectedexterior
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Antonyms for adventitious:

prearrangedorganiseddecideddevisedfundamentaladvisedfixedorganizedpreparedwilling
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Other 5-syllable words like adventitious

Here are some other common words that have 5 syllables, like adventitious does.

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