ETYM Latin observabilis: cf.French observable.
Worthy or capable of being observed; discernible; noticeable; remarkable.
Capable of being perceived especially by sight or hearing.
ETYM Latin perceptibilis: cf. French perceptible. Related to Perceive.
Capable of being perceived by the mind or senses.
ETYM French, from Latin sensibilis, from sensus sense.
1. Acting with or showing thought and good sense; SYN. thoughtful.
2. Aware intuitively or intellectually of something sensed.
3. Readily perceived by the senses.
4. Able to feel or perceive; SYN. sensitive.
Perceptibly, discernibly, noticeably; apparently, distinctly, clearly, plainly