Rarely
Rarely adverb - Not often.
Without warning and rarely are semantically related. In some cases you can use "Without warning" instead an adverb "Rarely".
Without warning
Rarely and without warning are semantically related. Sometimes you can use "Rarely" instead an adverb phrase "Without warning".
Mutual synonyms
Both terms in one sentence
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Henry DeTamble rarely travels forward in time, but he is often zapped into the past randomly and without warning.
Source: Future Me Scares Me - The Sneeze of Doom rarely comes without warning — usually the unlucky sneezer will be shown inhaling air a few seconds before it happens.
Source: Sneeze of Doom -
In Reborn City, Pokémon are scarce, the lake has more poison than water, plant life consumes whole wards quickly and without warning, and the population rarely ventures outside of the city.
Source: Video Game / Pokémon Reborn
Cite this Source
Without warning and Rarely. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/rarely/without_warning
Rarely & Without warning. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/rarely/without_warning>.
Without warning or Rarely. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/rarely/without_warning.
Google Ngram Viewer shows how "rarely" and "without warning" have occurred on timeline