Not penetrable by bullets. bullet-proof
ETYM Latin densus.
1. Hard to pass through because of dense growth; SYN. thick, packed.
2. Having high relative density or specific gravity; SYN. heavy, weighty, massive.
3. Permitting little if any light to pass through because of denseness of matter; SYN. heavy, impenetrable.
4. Slow to learn or understand; lacking intellectual acuity; SYN. dim, dull, dumb, obtuse, slow.
ETYM French hermétique. Related to Note under Hermes, 1.
The airtight sealing of an object.
Completely sealed; completely airtight.
Of or relating to sorcery or alchemy.
ETYM Latin impenetrabilis; pref. im- not + penetrabilis penetrable: cf. French impénétrable.
1. Impossible to understand.
2. Not admitting of penetration or passage into or through.
ETYM Pref. im- not + permeable: cf. French imperméable, Latin impermeabilis.
Preventing especially liquids to pass or diffuse through.
ETYM Latin impervius; pref. im- not + per through + via way. Related to Voyage.
Not admitting of passage or capable of being affected SYN. imperviable.
1. Set so close together as to be invulnerable to penetration
2. Securely or solidly fixed in place; rigid
3. Packed closely together
4. Of such close construction as to be impermeable
5. Closely constrained or constricted or constricting
6. (Economics) Affected by scarcity and expensive to borrow