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Adjective: well-timed  'wel 'tImd
  1. Done or happening at the appropriate or proper time
    "a well-timed warning";
    - timely, seasonable, well timed
Adverb: well-timed  'wel 'tImd
  1. At an opportune time
    "His well-timed joke lightened the tense atmosphere";
    - seasonably, timely, apropos

See also: opportune