suspicion

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act or an instance of suspecting something on little or no evidence.
• noun The condition of being suspected, especially of wrongdoing.
• noun The state or feeling of having no confidence or certainty about something; distrust.
• noun A minute amount or slight indication; a trace.
• transitive verb To suspect.

from The Century Dictionary.

• To regard with suspicion; suspect; mistrust; doubt.
• noun The act of suspecting; the feeling of one who suspects; the sentiment or passion which is excited by signs of evil, danger, or the like, without sufficient proof; the imagination of the existence of something, especially something wrong, without proof or with but slight proof.
• noun Thought.
• noun Suggestion; hint; small quantity; slight degree.
• noun Synonyms Jealousy, distrust, mistrust, doubt, fear, misgiving.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of suspecting; the imagination or apprehension of the existence of something (esp. something wrong or hurtful) without proof, or upon very slight evidence, or upon no evidence.
• noun colloq. Slight degree; suggestion; hint.
• transitive verb Obs. or Low To view with suspicion; to suspect; to doubt.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of suspecting something or someone, especially of something wrong.
• noun The condition of being suspected.
• noun Uncertainty, doubt.
• noun A trace, or slight indication.
• noun The imagining of something without evidence.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun being of a suspicious nature
• noun an impression that something might be the case
• noun doubt about someone's honesty
• noun the state of being suspected