That is looking on; watching, observing.(adjective)
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Use "onlooking" in a sentence
"Rather did he wish, as the sub-title of the book indicates, to offer a new method of training both mind and eye (and other senses as well), by means of which our modern 'onlooking' consciousness can be transformed into a new kind of 'participating' consciousness."
"I pointed at the newest arriving truck, backing into position according to the commands of onlooking Beholders."
"For the Modern Life Is Rubbish crowd, there's a lot to deplore in the new Weetabix ad, in which a nine-year-old girl, on gulping down a spoonful of the offending cereal, breaks into a crunk/bodypopping routine to a scrunching dubstep tune, accompanied by her teddy bears, leaving her three onlooking cross-legged friends gobsmacked with awe."