depthless

adjective

depth·​less -pt(h)lə̇s 

1

: immeasurable in depth : deep or profound beyond description

new insight into the depthless nature of her loneliness

—Ethel Waters

the depthless misery and heroism of the people they served

—Time

2

: lacking significant depth : shallow, superficial

it promises to make life impersonal, mechanized and depthless

—Time

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