Consistent and dependable in one's behaviour or performance(adjective)
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Use "rock-steady" in a sentence
"In terms of private religious behavior one finds virtually the same rock-steady levels of religiosity."
"Smart, sexy, rock-steady dad to two terrific teenage girls, he appeared without fanfare, drama, or angst...but I fell for him anyway."
"Driving and fortifying that reason with an unprecedented fearlessness, laser-like focus, unrelenting, rock-steady resolve and incredible intensity, the mission to fulfill a dedication can inspire lesser-known underdogs to reach dreams once thought unattainable."