By definition, the word "visible" means something you can see. Beware: you cannot see a light ray or beam or photon as it whizzes past you. You only see those rays that enter your eye. In a dusty atmosphere you might say you can see a light beam, but what you see is that part which is scattered into your eyes.
Yes, transparent means you can clearly see through the object. Translucent means only light travels through, you cannot see a clear image, and opaque means no light or image is visible.
Infra-red simply means less than red (referring to its place in the spectrum) and it is a wavelength that we cannot see. Similarly, ultra-violet means greater than violet and it is at the other end of the light spectrum, again of a wavelength that we cannot see. There are a lot of wavelengths of electro-magnetic radiation (as these are called) that we cannot see, radio waves being some of them.
Any abstract notion like love, hatred, happiness or misery takes more than one word to describe it.
transparent. translucent is partially obstructed and opaque is letting no light through.
The word that it means cannot be typed in an answer on WikiAnswers because of the profanity filter. See the Related Link for the answer. It is not a nice word!
Insoluble
Enigma
indestructible
atom
unbreakable
When you are a tour guide and you try to give a tour of someone elses Igloo you see the word undefined, which means you can't do that.
something that cannot be avoided = inevitable
Nope it means atom :)
inestimable
Irrefutable means cannot be disproved or dissagreed with.
The word is crossed.To see how to do it, see related link bellow.