At once
At once adverb - Without delay or hesitation; with no time intervening.
Offhand
Offhand adverb - Without previous thought or preparation.
At once and offhand are semantically related. Sometimes you can use "At once" instead an adverb "Offhand".
Nearby Words: offhandedly, offhanded
Mutual synonyms
Both terms in one sentence
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Phantom Lord ends with Makarov coming back from his injuries, exchanging two blows with Jose before using Fairy Law to beat him and his entire army at once (except for Aria, the Phantom Lord mage who drained Makarov of his magic in the first place who just gets an additional Offhand Backhand).
Cite this Source
Offhand and At once. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/at_once/offhand
At once & Offhand. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/at_once/offhand>.
Offhand or At once. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/at_once/offhand.
Google Ngram Viewer shows how "at once" and "offhand" have occurred on timeline