Reliable manufactures fire protection equipment for the toughest projects, helping you save lives and preserve property. 2 days ago · The meaning of RELIABLE is suitable or fit to be relied on : dependable. How to use reliable in a sentence. Someone or something that is reliable can be trusted or believed because he, she, or it works or…. RELIABLE definition: that may be relied on or trusted; dependable in achievement, accuracy, honesty, etc.. See examples of reliable used in a sentence. Definition of reliable adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. These adjectives mean worthy of reliance or trust: a reliable source of information; a dependable worker; a responsible babysitter; a trustworthy report; a trusty assistant. She was efficient and reliable. Japanese cars are so reliable.