unnoticeable

• But there came upon the surrounding air, so small as to be almost unnoticeable, a trilling sound. —  061 - Devil On The Moon
• Depending upon the target, a bomb attack could be totally unnoticeable or a major problem. —  Maximum Security -- Ch 8 -- Internet Warfare
• She returned to the Luerral Circuit and her hotel room alone except for her unnoticeable Service escorts, spent the next two hours asleep to get herself shifted over to the local time system, then dressed in a Tinokti fashion item, a sky-blue belted jacket of military cut and matching skirt, and had a belated breakfast in a stratosphere restaurant of the hotel. —  SCHMIT~1.TXT
• Fear and cold and even loneliness were as unnoticeable, in the presence of that dazzle of hunger, as stars at noon. —  The Cosmic Rape
• HID Laboratories allows building managers to dim their HID lights by an unnoticeable-to-the-human-eye 10 percent -- a move that could save megawatts of power, writer Michael Kanellos suggests: —  TEDTalks (video)

Roget's II: The New Thesaurus

Allen's Synonyms and Antonyms

Used in the Same Context