featureless

adjective

fea·​ture·​less ˈfēchə(r)lə̇s 

1

: having no distinct or distinctive features

the top is largely featureless plateau

—London Calling

the long featureless months with no special credit or romance

—Mary Webb

vast tracts of featureless ocean

—W. H. Dowdeswell

2

: inactive and without any material price change

—used of business or market activity

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