Lake turnover occurs when the layers of water with noted temperature differences begin to mix together and the water and debris that has been sitting at the bottom of the lake begins to mix with the layers of water above it.
Definition of cautious. : careful about avoiding danger or risk cautious investors cautious optimism.
1. self-confident-showing poise and confidence in your own worth; hardly more than a boy but firm-knit and self-confident. self-assured. confident-having or marked by confidence or assurance; a confident speaker; a confident reply; his manner is more confident these days; confident of fulfillment.