What is the definition for "imperceptible"? not having a large range of motion not wanting to leave a place not learning in an efficient manner not distinguishable by the senses

I think the best definition among the choices for the given word is the last option. Imperceptible can be defined as not distinguishable by the senses. The root word for the word is "perceptible" which means something being perceived by the senses ... When the prefix "im-" is added the word now means the opposite.