hypercorrect

Some writers, dimly sensing that were is posher, hypercorrect themselves and use it with open possibilities, such as He looked at me as if he suspected I were cheating on him and If he were surprised, he didn’t show it.

Labov and his successors found that people hypercorrect most in moments of self-consciousness—when switching into a shaky second language or addressing a crowd.

At viii 15 I has the hypercorrect nil for nihil, and at xiii 26 ethereos ... deos for aetherias ... domos, but in general has few signs of deliberate alteration.