observing

English Thesaurus

1. quick to notice; showing quick and keen perception (adj.all)

similar	:	perceptive,
definition	:	having the ability to perceive or understand; keen in discernment (adj.all)

derivation	:	detect, discover, find, notice, observe,
definition	:	discover or determine the existence, presence, or fact of (verb.perception)

derivation	:	detect, discover, find, notice, observe,
definition	:	discover or determine the existence, presence, or fact of (verb.perception)