Webster's 1828 Dictionary
UNSUSPECTING
a.Not imagining that any ill is designed; free from suspicion.
New American Oxford Dictionary
unsuspecting
un sus pect ing |ˌənsəˈspektiNG ˌənsəˈspɛktɪŋ | ▶adjective (of a person or animal ) not aware of the presence of danger; feeling no suspicion: antipersonnel mines lie in wait for their unsuspecting victims. DERIVATIVES un sus pect ing ly adverb, un sus pect ing ness noun
Oxford Dictionary
unsuspecting
un |sus ¦pect ¦ing |ʌnsəˈspɛktɪŋ | ▶adjective (of a person or animal ) not aware of the presence of danger; feeling no suspicion: anti-personnel mines lie in wait for their unsuspecting victims. DERIVATIVES unsuspectingly adverb, unsuspectingness noun
American Oxford Thesaurus
unsuspecting
unsuspecting adjective it's a trap deliberately set for unsuspecting first-time buyers: unsuspicious, unwary, unaware, unconscious, ignorant, unwitting; trusting, gullible, credulous, ingenuous, naive, wide-eyed. ANTONYMS wary.
Oxford Thesaurus
unsuspecting
unsuspecting adjective this is a very nasty trick to play on the unsuspecting public: unsuspicious, unwary, unaware, unconscious, off guard, ignorant, unknowing, unwitting, oblivious, heedless, unmindful; trusting, trustful; gullible, credulous, ingenuous, naive, innocent, dupable, easily deceived, easily taken in, exploitable; rare incognizant, nescient. ANTONYMS suspicious, knowing, wary.
Sanseido Wisdom Dictionary
unsuspecting
ù n sus p é ct ing 形容詞 (人を )疑わない, 怪しまない, 信用している .