The man had very jejune behavior in handling the situation. Jejune - juvenile, immature, also dull or insipid, among others.

Jejune(adj) : {dull, uninterested, insipid}; {immature, childish}; {non- nourishing, non-nutritional}

Sentences:-

1) Students are always jejune in Prof. Sharma's class [dull]

2) Since you are an IT professional, you should have handled the situation sagaciously rather than acting in a jejune manner [immature]

3) Being at onsite, I am having jejune diet and missing mother made cuisines [non-nourishing]

Diverticulitis is the inflammation of pouches on the outside of the colon that are thought to be formed by a lack of fibre causing increased pressures inside the colon. It requires hospitalisation, nil by mouth, IV antibiotics and sometimes surgery.

However, campylobacter jejune is a common species of bacterial intestinal flora that is a major cause of gastroenteritis (stomach flu). Diverticulitis is the inflammation of pouches on the outside of the colon that are thought to be formed by a lack of fibre causing increased pressures inside the colon. It requires hospitalisation, nil by mouth, IV antibiotics and sometimes surgery.

However, campylobacter jejune is a common species of bacterial intestinal flora that is a major cause of gastroenteritis (stomach flu).

demoralizing vocalizing, mind-numbing humming, jejune tune, trying crying, deadly medley, wrong song

Some things that could describe a person which begin with "J" are jovial, jolly, jejune, jowls, joking, jaywalking, jaw, jack of all trades, jabber, juvenile, jerk, James and John.