the.com/insubordination

Not following orders, done out loud enough that someone writes it down.

means Refusing to obey the lawful authority of someone who outranks you — defiance with a hierarchy attached.

from Built from Latin 'in-' (not) plus 'subordinare' (to subordinate, place in a lower rank) — itself from 'sub-' (under) and 'ordinare' (to order, arrange). So literally 'the state of not being placed under' — refusing to stay in the rank assigned to you.

legal flavor
common cause for lawful workplace termination
key ingredient
requires a direct order, not just an attitude
military cousin
can be prosecuted as a court-martial offense
not the same as
disagreeing quietly counts as insubordination, mild as it is
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