the.com/bluster

The sound of confidence running on empty.

means To talk loudly and forcefully, often with bluff or bravado, especially when there's not much substance behind the noise.

from Bluster is likely imitative in origin — it arose in the 1500s probably echoing the same windy family as 'blow' and 'blast,' and the word was first used for the roaring of wind and sea before it got attached to roaring people. The storm sense and the blowhard sense have lived side by side ever since, which is fitting: both are a lot of noisy air with nothing solid driving it.

origin
from old german word for blowing wind
tell
volume rises exactly as substance falls
favorite habitat
press conferences and group chats
function
fills silence where a plan should be
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