mediocre (adj.)

• adulterated
• artless
• average
• bad
• banal
• base
• blemished
• central
• common
• commonplace
• core
• damaged
• defective
• deficient
• dull
• equatorial
• equidistant
• erroneous
• everyday
• fair
• fairish
• fallible
• faulty
• halfway
• immature
• impaired
• imperfect
• imprecise
• impure
• inaccurate
• inadequate
• inapt
• inattentive
• incompetent
• incomplete
• indifferent
• inefficient
• inept
• inexact
• inexpert
• inferior
• insipid
• insufficient
• interior
• intermediate
• lacking
• lackluster
• little
• makeshift
• maladroit
• mean
• medial
• median
• mediterranean
• medium
• mesial
• mid
• middle
• middle-of-the-road
• middlemost
• middling
• midland
• midmost
• midway
• mixed
• moderate
• modest
• namby-pamby
• normal
• nuclear
• off
• ordinary
• partial
• passable
• patchy
• pedestrian
• petty
• poor
• respectable
• routine
• run-of-the-mill
• second-rate
• shabby
• short
• sketchy
• small
• so-so
• standard
• tedious
• third-rate
• thoughtless
• tolerable
• trivial
• undeveloped
• undistinguished
• uneven
• unexceptional
• unfinished
• unimaginative
• uninspired
• unintelligent
• unskillful
• unsound
• usual
• vapid
• wanting
• wishy-washy