for all intents and purposes

• to all intents and purposes (UK)
• eggcorns (mishearings due to unfamiliarity with the word intent): for all (intensive/intrinsic/intense/intense and/intended/etc.) purposes.

From the 16ᵗʰ century English-law phrase “to all intents, constructions, and purposes”, which is found in an act adopted under Henry VIII in 1547.

for all intents and purposes

1. For every functional purpose; in every practical sense; in every important respect

   Synonyms: practically, for all practical purposes, in practice

   For all intents and purposes, the case is closed.

   This treaty, for all intents and purposes, is no longer viable.

• effectively, essentially, in essence, in effect, practically, virtually