Firm against attack; fortified by nature or art; impregnable; strong.
Steadfast, with unwavering feeling. (Now mostly in set phrases like fast friend(s).)
Moving with great speed, or capable of doing so; swift, rapid; light.
Moving with great speed, or capable of doing so; swift, rapid; light.
Having a kinetic energy between 1 million and 20 million electron volts; often used to describe the energy state of free neutrons at the moment of their release by a nuclear fission or nuclear fusion reaction (i.e., before the neutrons have been slowed down by anything).
Of a place, characterised by business, hustle and bustle, etc.
Causing unusual rapidity of play or action.
Able to transfer data in a short period of time.
Deep or sound (of sleep); fast asleep (of people).
Not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent.
Having an extravagant lifestyle or immoral habits.dated
Uncharacteristically mature or promiscuous for one's age.dated, offensive, vernacular
Ahead of the correct time or schedule.
More sensitive to light than average.
Forms
comparative
faster
superlative
fastest
Example sentences3835 results
I found a solution, but I found it so fast that it can't be the right solution.
Lingaku