crescent shaped (adjective) crescent: sickle-shaped
Sinonime: chance,
contingency, emprise, endangerment, enterprise,
experience,
exploit, feat,
happening,
hazard,
incident,
jeopardy,
occurrence,
peril,
scene,
speculation,
trip, undertaking, venture
Antonime: avoidance, inaction, inactivity,
inertia, latency, passiveness, stillness