1. the state or quality of not being fully developed or grown
2. childish or irresponsible behavior; lack of emotional or mental development appropriate for one’s age

Examples

• The fruit’s immaturity was evident from its green color and hard texture.
• His immaturity showed when he threw a tantrum after losing the game.
• The immaturity of the technology made it unreliable for commercial use.
• Her emotional immaturity made it difficult for her to handle criticism.
• The teacher addressed the student’s immaturity with patience and guidance.
• The immaturity of the seedlings required careful protection from frost.
• His immaturity in relationships caused problems with his girlfriend.