What does 不见得 (bù jiàn de) mean in English?

Card 63HSK 2010 Level 563/1311
CARD63
PROGRESS5%
不见得
不見得
bù jiàn de
not necessarily; not likely

Reveal: Click/Space/Enter/↑↓/w/s/j/kNavigate: ←→/h/l/a/d