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flaw 1

1. An imperfection, often concealed, that impairs soundness: a flaw in the crystal that caused it to shatter. See Synonyms at blemish.
2. A defect or shortcoming in something intangible: The two leaders share the flaw of arrogance.
tr.v. flawed, flaw·ing, flaws
To cause a flaw in; make defective: an argument that was flawed by specious reasoning.

[Middle English flaue, splinter, perhaps from Old Norse flaga, slab of stone; see plāk- in Indo-European roots.]

flaw 2

A quick, intense burst, especially of wind, rain, or snow.

[Probably of Scandinavian origin; akin to Swedish flaga, gust of wind.]

flaw′y adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.