missed by mile (verb) miscalculate: make a mistake
Sinonime: ad hoc, ad-lib, automatic, autoschediastic, by ear, casual, expedient, extemporary, extempore, fake*, free, immediate, impromptu, improv, improvisatory, improvised, improviso, informal, jamming, made-up, makeshift, offhand, on impulse, on-the-spot, snap, spontaneous, spur-of-the-moment, toss off, toss out, unplanned, unpremeditated, unprepared, unrehearsed, unstudied, winging it
Antonime: do correctly, figure correctly,
succeed