The best replacement for reliable is valid.

The best alternatives to reliable are rated as following:
★★★★★  valid
★★★  dependable
★★★  unreliable narrator
★★  unreliable sources
★  accurate
★  unreliable
★  credible
★  rowenta
★  trustworthy
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Speaking about reliable, one probably shouldn't forget about being valid.

Other search terms related to reliable and their ratings are:
★★★★★ being valid
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