unexceptionable

Concise Oxford English Dictionary © 2008 Oxford University Press:
unexceptionable/ʌnɪkˈsepʃənəbl/

▶adjective not open to objection, but not particularly new or exciting.

– derivatives
unexceptionableness noun,
unexceptionably adverb.

usage: There is an overlap in meaning between the words unexceptionable and unexceptional. Strictly speaking, unexceptionable means ‘not open to objection’ (this view is unexceptionable in itself), while unexceptional means ‘not out of the ordinary; usual’ (the hotel was adequate but unexceptional). However, the meaning of unexceptionable is often indeterminate between ‘not open to objection’ and ‘ordinary’, as in the food was bland and unexceptionable.