is similar to
having no weak points
"an airtight defense"; "an airtight argument"
is similar to
able to resist the explosive force of bombs and shells
"bombproof shelter"
is similar to
capable of being defended
is similar to
immune to attack; incapable of being tampered with
"an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
is similar to
set so close together as to be invulnerable to penetration
"in tight formation"; "a tight blockade"
is similar to
protected from danger or bad weather
"a sheltered harbor"
is similar to
beyond the reach of criticism or attack or impeachment
"for the first time criticism was directed at a hitherto untouchable target"- Newsweek
see also
not capable of being conquered or vanquished or overcome
"a tribute to his courage...and his unconquerable will"- R.E.Danielson; "faced unconquerable difficulties"
see also
kept safe or defended from danger or injury or loss
"the most protected spot I could find"
see also
free from danger or the risk of harm
"a safe trip"; "you will be safe here"; "a safe place"; "a safe bet"
see also
free from danger or risk
"secure from harm"; "his fortune was secure"; "made a secure place for himself in his field"