Six kinds of unsatisfactory disciples are described in the scriptures:

alir bāṇo jyotiṣakaḥ
stabdhībhūtaḥ kimekakaḥ
preṣita-preṣakaś caiva
ṣaḍ ete sevakādhamāḥ

“These six are the ‘bee’ (ali), so called because of his fickleness; the bāṇa, who talks back, piercing his master like an arrow; the procrastinator (jyotiṣaka); the servant who is lazy and inactive (stabdhībhūta); the one who refuses to try to do anything on his own (kimekaka), and the one who passes the buck (preṣita-preṣaka).”