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Jeremy Crawford wrote the following:

The mind blank spell is meant to protect you entirely from the feeblemind spell.

Yet, according to the description of Mind Blank, the spell only protects against these effects:

  • Psychic damage
  • Effect that would sense emotions or read thoughts
  • Divination spells
  • Charmed condition

The Feeblemind spell does the followings:

  • Inflicts 4d6 psychic damage
  • Sets a creature's Intelligence and Charisma scores to 1
  • Prevents spell casting
  • Prevents magic items activation
  • Stops language understanding & communication

Only the first of these effects is explicitly stopped by Mind Blank.

Why would the other effects be nullified by Mind Blank?

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From the Mind Blank spell description:

The spell even foils wish spells and spells or effects of similar power used to affect the target’s mind or to gain information about the target.

From the Feeblemind spell description:

You blast the mind of a creature that you can see within range, attempting to shatter its intellect and personality.

(emphasis mine)

Remember that there is no flavour text in 5e spells so Feeblemind really does blast a target's mind.

Feeblemind is of inferior power to Wish (since Wish can recreate Feeblemind and is one level higher) and Feeblemind clearly affects the target's mind, so it seems to me like Mind Blank would cancel all of the Feeblemind effects altogether.

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  • \$\begingroup\$ Could you elaborate why you think "Feeblemind" qualifies as a "similar power"? And do you think it protects against other spells that do not explicitly satisfy the conditions of Mind Blank? \$\endgroup\$ – Merudo Apr 26 '19 at 8:42
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    \$\begingroup\$ @Merudo Wish is Feeblemind plus some more and is a level higher so it seems evident that it is more powerful. As for your second question, see spells only do what they say they do \$\endgroup\$ – Pierre Cathé Apr 26 '19 at 8:47
  • \$\begingroup\$ Another question: from your reading of the ability, would Mind Blank protect against Zone of Truth? People have voted No (rpg.stackexchange.com/questions/74670/…) \$\endgroup\$ – Merudo Apr 26 '19 at 9:56
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    \$\begingroup\$ @Merudo I agree with the accepted answer to that question, though if you have a different reading you should post another answer there ! \$\endgroup\$ – Pierre Cathé Apr 26 '19 at 11:05
  • \$\begingroup\$ @Merudo I think the answer there depends on how you define Zone of Truth: does it mentally prohibit you from lying (i.e. it affects your mind) or is it physical (i.e. Mind Blank won't do a thing)? \$\endgroup\$ – PixelMaster Apr 26 '19 at 16:55
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Because of Mind Blank's additional description.

Mind Blank offers the definitive, undebateable benefits you list in your question. However, it also grants the following benefit (emphasis mine):

The spell even foils wish spells and spells or effects of similar power used to affect the target's mind or to gain information about the target.

Feeblemind clearly affects your mind, and it's actually even less powerful than a Wish spell. It still boils down to DM adjudication, but I think it's safe to say that Feeblemind "affects your mind".

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