Below are possible answers for the crossword clue Not brilliant.
3 letter answer(s) to not brilliant
DIM
become dim or lusterless; "the lights dimmed and the curtain rose"
become vague or indistinct; "The distinction between the two theories blurred"
lacking clarity or distinctness;
lacking in light; not bright or harsh; "a dim light beside the bed"; "subdued lights and soft music"
made dim or less bright; "the dimmed houselights brought a hush of anticipation"; "dimmed headlights"; "we like dimmed lights when we have dinner"
make dim by comparison or conceal
make dim or lusterless; "Time had dimmed the silver"
offering little or no hope; "the future looked black"; "prospects were bleak"; "Life in the Aran Islands has always been bleak and difficult"- J.M.Synge; "took a dim view of things"
slow to learn or understand; lacking intellectual acuity; "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"-
4 letter answer(s) to not brilliant
PALE
(of light) lacking in intensity or brightness; dim or feeble;
a wooden strip forming part of a fence
abnormally deficient in color as suggesting physical or emotional distress;
lacking in vitality or interest or effectiveness;
not full or rich; "high, pale, pure and lovely song"
turn pale, as if in fear
very light colored; highly diluted with white; "pale seagreen"; "pale blue eyes"
Wan
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