Constant
Reliable
Reliable adjective - Worthy of one's trust.
Usage example: I need a reliable car that's not going to break down constantly
Constant is a synonym for reliable in trustworthy topic. Sometimes you can use "Constant" instead an adjective "Reliable", if it concerns topics such as character trait, steadfast.
Mutual synonyms
Related pairs
Both words in one sentence
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Heterosexual Life-Partners: He's Lupin's most constant and reliable companion.
Source: Characters / Lupin III - Growing up in the shadow of constant apocalypse not only made him a more reliable and effective fighter than he would otherwise, but it causes him to develop a strong sense of moral responsibility from an early age that regular Trunks lacks.
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Except the Tau, they just skirt around it, with the result of being much slower than other sides (their drive speed is typically 1/5 of Imperium's), but being much safer, more reliable (speed is relatively constant), and doesn't need psychic on board to guide the ship (which Tau lacks).
Cite this Source
Reliable and Constant. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/constant/reliable
Constant & Reliable. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/constant/reliable>.
Reliable or Constant. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/constant/reliable.
Google Ngram Viewer shows how "constant" and "reliable" have occurred on timeline