This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or containing pebbles.

adj. With a surface like that of pebbles.

adj. Full of pebbles; pebbled.

Full of pebbles; abounding with small roundish stones.

adj. abounding in small stones

"Now, I just dribble in water until the mixture is "pebbly" and forming small clumps of dough."

unsmooth    rough   

pebble   

pebbled   

gravelly    shingly    alluvial    rock-strewn    rushy    oozy    weedy    shelly    sandy    hard-packed