- sessile, attached - permanently attached to a substrate; not free to move about; "an attached oyster"; "sessile marine animals and plants"
Antonyms: vagile, free-swimming, unattached
- sessile, stalkless - attached directly by the base; not having an intervening stalk; "sessile flowers"; "the shell of a sessile barnacle is attached directly to a substrate"
Antonyms: pedunculate, stalked