habit
A person who acts without thinking is usually called "impulsive."
obsession
You are probably thinking of the word 'try.' The word 'trial' is derived from 'try.'
A seven (7) letter word without vowels: glycyls
"Responsive" is the word describing reacting quickly and positively.
Activities that do not involve thinking back on past experiences or actions, such as mindlessly reacting to situations without considering their implications or consequences, or engaging in tasks without pausing to review or analyze them afterward.
The manner of thinking, behaving, or reacting characteristic of a specific person
I have a tenancy to speak without thinking first
Inconsiderate.
He does everything without thinking. He is so impetuous.
thinking,symbolizing,expressing,transmitting,receiving,decoding,reacting and monitoring
I wonder if you are thinking of words like rash, impetuous, implusive.
Illogical is from the Greek word logos (reason or thinking). The prefix il- signifies "without"
i think they're plants grown without soil, but I'm not sure i might be thinking of a different word
habit
there is a lot of word for thinking about him one that some girl say is thinking and that's it