1.
timidity; faintheartedness; lack of confidence
A tendency to be pessimistic, hesitant, or lacking in assertiveness. Describes someone who easily gives in or loses confidence.
2.
bearishness; pessimistic outlook on the market
In finance, a pessimistic view that prices will fall. The opposite of 強気 (bullish).
Usage
弱気 functions as both a noun (弱気になる — to become timid) and a na-adjective (弱気な態度 — a timid attitude). The antonym is 強気 (bold, bullish).
In everyday use, 弱気 describes a temporary state of losing confidence, not a permanent personality trait. In financial contexts, it is the standard term for bearish sentiment.