blah
[noun]
Synonyms: nonsense, balderdash, blather, blatherskite, bosh, bunkum, eyewash, hooey, humbug, pishposh
[adjective]
Synonyms: dull, banausic, dim, dreary, humdrum, monotone, monotonous, pedestrian, plodding, stodgy

[TahlilGaran] English Synonym Dictionary ▲

I. blah¹ /blɑː/ noun
[Date: 1900-2000; Origin: From the sound of empty talk]

1. blah, blah, blah spoken used when you do not need to complete what you are saying because it is boring or because the person you are talking to already knows it:
You know how Michelle talks: ‘Tommy did this, and Jesse did that, blah, blah, blah.’

2. [uncountable] British English spoken remarks or statements that are boring and do not mean much:
the usual blah about everyone working harder

3. the blahs [plural] American English informal a feeling of being sad and bored:
a case of the winter blahs

[TahlilGaran] Dictionary of Contemporary English ▲

II. blah² adjective American English spoken informal

1. not having an interesting taste, appearance, character etc:
The chili was kind of blah.

2. slightly ill or unhappy:
I feel really blah today.

[TahlilGaran] Dictionary of Contemporary English ▲