sessile

Definitions of sessile
1

adj attached directly by the base; not having an intervening stalk

sessile flowers”
“the shell of a sessile barnacle is attached directly to a substrate”
Synonyms:
stalkless
Antonyms:
pedunculate, stalked
having or growing on or from a peduncle or stalk

adj permanently attached to a substrate; not free to move about

sessile marine animals and plants”
Antonyms:
vagile
having freedom to move about
free-swimming, unattached
(of animals) able to swim about; not attached
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