Final answer:
A bearish investor attitude is best described as pessimistic since it reflects expectations of declining stock prices and a general lack of confidence in the market.
Step-by-step explanation:
The adjective that would best describe a bearish investor attitude is pessimistic. A bearish investor expects stocks to decline, indicating a lack of confidence in market performance, which aligns with a pessimistic outlook. In contrast to a bearish perspective, a bullish investor would display an optimistic or positive attitude, expecting stock prices to rise.