unfavourably

From unfavourable +‎ -ly.

unfavourably (comparative more unfavourably, superlative most unfavourably)

1. (British spelling) In an unfavourable manner.
   • 1962 June, Rupert Shervington, “The planning and execution of the Kent coast electrification”, in Modern Railways, page 390:

     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.

• unfavorably

• “unfavourably”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.