At once and on the spot
Without the least delay and at once and on the spot are semantically related. In some cases you can replace phrase "Without the least delay" with "At once and on the spot", this phrases are similar.
Without the least delay
At once and on the spot and without the least delay are semantically related. Sometimes you can replace phrase "At once and on the spot" with "Without the least delay", this phrases are similar.
Mutual synonyms
Cite this Source
Without the least delay and At once and on the spot. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/at_once_and_on_the_spot/without_the_least_delay
At once and on the spot & Without the least delay. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/at_once_and_on_the_spot/without_the_least_delay>.
Without the least delay or At once and on the spot. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/at_once_and_on_the_spot/without_the_least_delay.