Longman Dictionary of Contemporary English - suspiciously

~ adv 1 in a way that shows you think someone has done something wrong or dishonest  (Meg looked at me very suspiciously.) 2 in a way that makes people think that something bad or illegal is happening  (He saw two youths acting suspiciously outside the pub.) 3 in a way that shows you think there is probably something wrong with something  (They sat in silence, eyeing the food suspiciously.) 4 looks/sounds etc suspiciously like often humorous used when saying that something is very like something else  (That pen looks suspiciously like the one I lost last week!)