1) Least believable 2) Least convincing 3) Least effectual 4) Least impressive 5) Least likely 6) Least plausible 7) Least satisfactory 8) Least sensible 9) Least valid 10) Like the most unlikely excuse 11) Like the worst of excuses 12) Most contrived 13) Most feeble 14) Most halting 15) Most inadequate