Synonyms for fail:
Sense 2 (noun)
let down, disappoint.
Sense 3 (noun)
backfire, sink, decline.
Sense 5 (noun)
backpedal, renege, go back on.
Sense 6 (noun)
graduate, downgrade, grade, promote, track, mark down, mark.
Sense 7 (noun)
Sense 8 (noun)
parch, the dry season, dry, drought.
Sense 10 (noun)
fade, degenerate, deteriorate, wane, waste, languish, fizzle.
abandon, forsake (verb)
disregard, disappoint, omit, ignore, forget, let down, overlook, neglect.
be unsuccessful (verb)
break down, flounder, founder, miscarry, fizzle, flop, miss, fall, decline, fold, blunder, deteriorate, go wrong, go down, abort, fall short.
falter, flop, fall, flounder, fall short, stumble, lose, flunk, blunder, bust, collapse.
disregard, overlook, forget, ignore, neglect.
burn out, bloodbath, pack up, close up, closure, elude, evade, sell out, backfire, unravel, deselect, shut down, choke up, qualify, liquidation, cut out, dip out, ax, sell off, thrive, shut.
crack-up, jam, liquidate, sour, go under, grief, wane, downgrade, degenerate, lag, certify, deteriorate, short, nosedive, atrophy, fizzle.
mark down, tank, go off, go down.
get through, go for, fold, grade, freeze, wind up, strike out, graduate, crash, decline, fade.
promote, sit, retake.
waste, back up.
sink, lose it.
break down, run low, conk.
slip up on.
peter out, die out.