1) behaving in a proud, superior way; (of behaviour etc) showing too much pride in oneself and too little thought for others (arrogant)
2) (an act of making) a statement or decision that is based on too little detail or too few examples (generalization)
3) taking too little care; guilty of neglect (negligent)
4) to charge (a person) too little for something (undercharge)
5) having had too little food (underfed)
not adequate; not enough; (of a person) not able, skilled or strong enough
defective, insufficient, incompetent
not having enough workers to do the work
inadequate in work force
