fallible (adj.)

• adulterated
• blemished
• careless
• damaged
• defective
• deficient
• errable
• errant
• erroneous
• error-prone
• faulty
• heedless
• immature
• impaired
• imperfect
• imprecise
• impure
• inaccurate
• inadequate
• incomplete
• inexact
• lacking
• makeshift
• mediocre
• mixed
• off
• partial
• patchy
• short
• sketchy
• undeveloped
• uneven
• unfinished
• unsound
• wanting