1. In an imperceptible manner or to an imperceptible degree
   "the power of the Secretary of State in London increased gradually but imperceptibly"
   - unnoticeably

See also: imperceptible

Antonym: perceptibly

• incongruence
• incongruent
• incongruity
• incongruous
• incongruously
• incongruousness
• inconnu
• inconsequence
• inconsequent
• inconsequential
• inconsequentiality
• inconsequentially
• inconsequently
• inconsiderable
• inconsiderate
• inconsiderately
• inconsiderateness
• inconsideration
• inconsistency
• inconsistent
• inconsistently
• inconsolable
• inconsolably
• inconsonant
• inconspicuous