Trend is highs and lows, with consecutive lower lows defining a bear market.

The question then is what time period do you use for your analysis.

Daily and Weekly has been defined as you can also include weekly upward trend lines having been violated.

The Monthly still has another 80 points or so on the S&P futures market. Another indicator is to look at the macro of the economy such as earnings and GDP. These data points to the market going lower. For how long? Unknown as it could only be for another month that leads to consolidation and not further trend decline.