Ant. Imperceptible, indistinguishable, insensible, inappreciable.
Perceive. Comprehend, apprehend, conceive, understand.
Ant. Ignore, lose, miss, fail of, overlook, misconceive, misapprehend.
Perception. Discernment, apprehension, recognition, understanding, comprehension, feeling, sensation, sense.
Ant. Conception, concept, imagination, idea, notion; misunderstanding.
Percolate. Filter, strain, exude, drain, ooze.
Ant. Flow, rush, stream, run, disgorge.
Percussion. Shock, clash, collision, concussion, encounter.
Ant. Recoil, rebound, reverberation.
Perdition. Loss, ruin, destruction, overthrow, wreck, demolition.