na-adjective, noun
dry and tasteless; dull; insipid
Describes something that is literally dry and lacking flavor, or figuratively dull and uninteresting. Often used for food, writing, or personality.
このパンは乾燥無味で、何もつけずには食べられない。
This bread is dry and tasteless; I can't eat it without something on it.
彼の講義は乾燥無味で、学生たちはみんな退屈していた。
His lecture was dull and insipid, and all the students were bored.