unfavourably

comparative more unfavourably · superlative most unfavourably · alternative unfavorably

1. UK standard spelling of unfavorably.

   Neither the Type 2 nor the Type 3 locomotives have so far reached a satisfactory standard of performance. [...] The number of miles per failure is still too low and therefore compares unfavourably with steam engine performance.

   1962 June, Rupert Shervington, “The planning and execution of the Kent coast electrification”, in Modern Railways, page 390