Delphic
Etymology
From the Oracle of Delphi, the priestess of Apollo whose prophecies were famously cryptic. Told that if he attacked he would "destroy a great empire," King Croesus went to war — and destroyed his own. The adjective names that same studied ambiguity, the answer that seems wise precisely because it can be read to fit anything.
adjective · /DEL-fik/
Deliberately obscure or ambiguous, so that the meaning can be read more than one way.
What it names
Pronouncements that sound profound while carefully committing to nothing — use it for statements crafted to be unfalsifiable, whichever way events turn out.
Example
The CEO’s delphic memo about "recalibrating priorities" left everyone guessing whether layoffs were coming.
Related idea
Cryptic means simply hard to understand; delphic implies the vagueness is oracular and deliberate — obscure in a way that hedges every outcome.