Answer: heavier

AnswerCrossword Clue
HEAVIER... than air.
heavierclumsy
heavierserious
heavierintense
heavierof great weight, amount, size, force, or intensity
heavierHEAVY, weighty (having a great weight)
HEAVIERLike a downpour, vis- -vis a sprinkle
HEAVIERMore serious
HEAVIERMore substantial
HEAVIERMore weighty
HEAVIERPre-diet appearance.
HEAVIERMore burdensome.
HEAVIER...-than-air.
HEAVIEROf greater importance.
HEAVIERWeightier
HEAVIERDeeper in content
HEAVIERTougher to tote