gaps russian

• пло́тно

  tightly, firmly, without gaps

  densely

  substantial, hearty, full

• на́глухо

  tightly securely (leaving no gaps)

• преры́вистый

  intermittent, broken or interrupted (having gaps) (bookish)

• подучи́ть

  learn/fill in gaps in knowledge/brush up on

• щеля́стый

  gappy, cracked, full of gaps, fissured

Examples

• У меня много пробелов в матема́тике.There's a lot of gaps in my knowledge of math.
• В его зуба́х бы́ли бреши.His teeth had gaps.