The only one I can think of is 'hypo'.
Do you think you're perfect?
think perfect tense
his mother was not mentaly challenged
I think you are indicating the word "deficient" which means "lacking something."
Just think of things you like for example: a food, color, sport or store and then add your initilals or numbers.
I think most abundant component of living cell is water
bjher facvopfs hdja f
i think it is carbohydrates
Hydrogen I think.
i think red
The future perfect tense of think is will have thought.