Present, Future 疑わしい is [x] 疑わしくない is not [x] Past 疑わしかった was [x] 疑わしくなかった was not [x] Te-form, Continuative 疑わしくて is [x] and... 疑わしくなくて is not [x] and... Provisional 疑わしければ if it is [x] 疑わしくなければ if it is not [x] Conditional 疑わしかったら when/if it is [x] 疑わしくなかったら when/if it is not [x] Adverbial 疑わしく [x]-ly Noun form 疑わしさ [x]-ness