Synonyms for O:

• adv.

  •huggermugger (adverb)
  • confidentially,
  • covertly,
  • furtively,
  • hush-hush,
  • in camera,
  • in secret,
  • insidiously,
  • intimately,
  • obscurely,
  • clandestinely,
  • in confidence,
  • behind closed doors,
  • in strict confidence,
  • by stealth,
  • behind someone's back,
  • in holes and corners,
  • on the qt.

• adv

  •secretly (adverb)
  • huggermugger.

• n.

  •communication (noun)
  • o.
  •energy (noun)
  • get-up-and-go.
  •get-up-and-go (noun)
  • activity,
  • animation,
  • application,
  • ardor,
  • birr,
  • dash,
  • drive,
  • effectiveness,
  • efficacy,
  • efficiency,
  • endurance,
  • enterprise,
  • exertion,
  • fire,
  • force,
  • fortitude,
  • go,
  • hardihood,
  • initiative,
  • intensity,
  • juice,
  • life,
  • liveliness,
  • might,
  • moxie,
  • muscle,
  • Oes,
  • forcefulness,
  • get up and go.

• Other synonyms:

  •adv.
  • intimately,
  • in holes and corners.
  •adv
  • furtively,
  • in camera,
  • in secret,
  • insidiously,
  • in confidence,
  • in strict confidence,
  • by stealth,
  • behind someone's back.
  •n.
  • alphabetic character,
  • blood group,
  • blood type,
  • chemical element,
  • element,
  • gas,
  • letter,
  • letter of the alphabet.

Antonyms for O:

• n.

  • get-up-and-go
    apathy, dullness, helplessness, idleness, impotence, inability, inactivity, incompetence, indifference, indolence, ineffectiveness, inefficiency, laziness, lethargy, powerlessness, uselessness, weakness.