As an adjective teeniest
is superlative of teeny.
As a noun teenies is
plural of teenie.
teeniest
English
Adjective
(head)
(teeny)
teeny
English
Etymology 1
From
Adjective
(er)
(informal) Very small; tiny.
Synonyms
* (very small)
*: (standard): minuscule, minute, tiny
*: (informal): teensy, teensy-weensy, teeny-weeny, weeny, eeny
Etymology 2
. See (teen) grief.