J
- Jabber – chatter rapidly and unintelligibly
- Jaded – fatigued
- Jeopardize – threaten, put to risk
- Jettison – throw or drop something from an aircraft o ship
- Junket – a trip or journey, a festive social affair
- Jocose – humorous
- Juggernaut – huge and powerful force
- Juxtapose – to put things next to each other that are not similar