expression, na-adjective
tasteless; dry as dust; insipid; flat; dull
Idiomatic expression comparing something to the sensation of chewing sand: utterly flavorless, uninteresting, or lifeless. Often used for food, conversation, or experiences that lack appeal.
このパンは砂を噛むようで、とても食べられたものじゃない。
This bread is as dry as dust; it's completely inedible.
彼の話は砂を噛むようで、聞いているのが苦痛だった。
His story was so dull it was painful to listen to.
A set phrase literally meaning 'like chewing sand'. The exact origin is uncertain, but it is a natural metaphor for extreme dryness and lack of flavor.