Misintended

One of thoſe archers cloſely I did ſpy, / ayming his arrovv at my very hart: / vvhen ſuddenly vvith tvvincle of her eye, / the Damzell broke his miſintended dart.

An action can thus be misconceived or misintended even when executed perfectly, because intentions themselves have purposes beyond the realization of an action.