DODDERING
doddering, doddery, gaga, senile
(adjective) mentally or physically infirm with age; “his mother was doddering and frail”
Source: WordNet® 3.1
Adjective
doddering (not comparable)
mentally or physically infirm due to old age; senile
Verb
doddering
present participle of dodder
Noun
doddering (plural dodderings)
A shaking or trembling movement, as of old age.
Source: Wiktionary
DODDER
Dod"der, n. Etym: [Cf. Dan. dodder, Sw. dodra, G. dotter.] (Bot.)
Definition: A plant of the genus Cuscuta. It is a leafless parasitical vine
with yellowish threadlike stems. It attaches itself to some other
plant, as to flax, goldenrod, etc., and decaying at the root. is
nourished by the plant that supports it.
Dod"der, v. t. & i. Etym: [Cf. AS. dyderian to deceive, delude, and
E. didder, dudder.]
Definition: To shake, tremble, or totter. "The doddering mast." Thomson.
Source: Webster’s Unabridged Dictionary 1913 Edition