| observant(sympathetic, witting, all-embracing) |
| observative(sympathetic, witting, all-embracing) |
| on the beam(expression, idiom, sympathetic, witting, all-embracing) |
| on to(expression, respectful, supraliminal) |
| on toes(expression, sympathetic, witting, all-embracing) |
| on top of(verb, expression, idiom, understand, apperceive) |
| pay attention(verb, expression, catch, observe, heed) |
| paying attention(verb, expression, heed, babysit) |
| perceiving(adjective, understanding, knowing) |
| percipient(sympathetic, witting, respectful, all-embracing, supraliminal) |
| plugged in(expression, sympathetic, witting, all-embracing) |
| realizing(understanding, sympathetic, witting, knowing, respectful) |
| recognizing(adjective, understanding, knowing, respectful, supraliminal) |
| respectful |
| savvy(verb, get, accept, appreciate, master) |
| see daylight(verb, expression, appreciate, fathom, apperceive) |
| sense(verb, get, accept, appreciate, master) |
| sensitive to(expression, respectful, supraliminal) |
| sentient(respectful, supraliminal) |
| sharp-eyed(sympathetic, witting, all-embracing) |