Superlative form of teensy: most teensy.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "teensiest" in a sentence
"It might have been the teensiest bit dangerous for them to get out on a major highway and risk their own lives to check on a coyote, doncha think?"
"This is perhaps the teensiest bit eccentric, and I am not surprised."
"It is blended to create the perfect pH level for acid-loving plants without recourse to the teensiest drop of peat, and is naturally high in potash, too, to encourage great flowering."