German deck
tief
adjective·a2

tief

Deep; low (in depth, pitch, or intensity)

Das Wasser ist tief.

Er hat eine tiefe Stimme.

predicativetief
predicative form: deep/low
with articledas tiefe Wasser
with article (attributive): the deep (e.g., the deep water)
comparativetiefer
comparative: deeper / lower
superlativeam tiefsten
superlative: deepest / lowest