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reliable (adj.)

1560s, raliabill, "that may be relied on, fit to be depended on, trustworthy," originally Scottish; see rely + -able. Not common before 1850, and often execrated thereafter in Britain as an Americanism because it involves a use of -able different from its use in provable, etc., and not warranted in classical Latin. But it is defended (by OED, Century Dictionary, etc.) on grounds of the suffix's sense in available, laughable, livable, dependable; indispensable, etc. Related: Reliably; reliableness. As a noun, "a reliable person, beast, or thing," by 1890 (with old).

Reliable expresses what cannot be expressed by any other one word. Moreover, it conveys an idea of constant occurrence. He who would be exact has, indeed, no alternative, if he avoids it except a periphrasis. [Fitzedward Hall, "On English Adjectives in -Able," 1877] 

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Definitions of reliable from WordNet

reliable (adj.)
worthy of being depended on;
a reliable source of information
Synonyms: dependable / honest / true
reliable (adj.)
worthy of reliance or trust;
a reliable source of information
Synonyms: dependable
reliable (adj.)
conforming to fact and therefore worthy of belief;
reliable information
Synonyms: authentic
From wordnet.princeton.edu