We present a new bound on the ultralight axion (ULA) dark matter mass m_{a}, using the Lyman-alpha forest to look for suppressed cosmic structure growth: a 95% lower limit m_{a}>2×10^{-20} eV. This strongly disfavors (>99.7% credibility) the canonical ULA with 10^{-22} eV
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School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia.
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