(as) dull as ditchwater

Thesaurus: synonyms, antonyms, and examples

not having a strong taste or flavour
blandThe soup is very bland, it could use more herbs and spices.
tastelessThe boiled chicken is practically tasteless.
flavourlessUKThese tomatoes from the grocer's are flavourless.
insipidHe was drinking an insipid light beer.
watered-downThe bar served bad food and watered-down cocktails.

SMART Vocabulary: related words and phrases

Flavours & tastes
acidic
acidulous
acridly
aftertaste
ageusia
flavourless
flavoursome
fruitily
fruitiness
full-bodied
pungent
savory
savoury
seasoned
semi-sweet
sharpness
vinous
watery
winey
woodsy

You can also find related words, phrases, and synonyms in the topics:

Not pleasant to eat or drink