unreasonably
1 synonym and 1 antonym for unreasonably, grouped by meaning and by how common each one is.
Adv — In a way that is not reasonable.
Synonyms
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
immoderately
Antonyms
Etymology
Comes from Middle English unresonably, made up of unreasonable and -ly, modelled on resonably (which gave us reasonably) and, originally, on Late Latin irratiōnābiliter.
Full origin of unreasonably →