mightest

1. 1
   verbarchaic

   Second-person singular simple past indicative of may. Archaic, used with thou.

   Note

   An agreement ending, not a new meaning: might + -est, the shape the past of may took beside thou. It belongs with thou alone and, like any modal, takes a bare verb after it: thou mightest enter, never thou mightest to enter. Writers after period flavor should keep pronoun and verb matched, so you might but thou mightest. The same spelling once also served as the obsolete 'most mighty'.

2. 2
   adjectiveobsolete

   Superlative form of might.

   Note

   Here might is the old adjective meaning "mighty, powerful," and -est makes it a superlative, so the mightest warrior is the most powerful one. That adjective has long dropped out of use, and modern English says mightiest, built on mighty, instead. In old texts, position settles which form you are reading. Before a noun it is this superlative. After thou it is the past of may.

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