Find Antonyms
duly Antonyms
Opposite of duly
Because the opposite of duly shifts with each meaning, the 9 antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
• adverb (Context 1)
In accordance with what is required, expected, or appropriate; in a proper or formal manner.
Usage Example
"The contract was unduly signed and witnessed by all parties involved."
Strongest
unduly
improperly
Strong
inappropriately
unlawfully
incorrectly
• adverb (Context 2)
At the proper, expected, or appointed time; punctually.
Usage Example
"The morning express train belatedly arrived at the platform at eight o'clock."
Strongest
belatedly
tardily
Strong
late
prematurely
Similar words to duly
Words similar to duly shift depending on context. Common synonyms include:
properly
appropriately
punctually
fittingly
on time
suitably
rightfully
promptly
Cite this Entry
Wordmom. (2026). Antonyms for Duly. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/duly