1) Likeacolander 1) Allowing passage in and out 2) Describing some socks 3) Full of flaws 4) Full of gaps 5) Honeycombed 6) Leaky 7) Like a moth-eaten coat 8) Like a sieve 9) Like bad alibis 10) Like Canadian Swiss cheese 11) Like cheesecloth 12) Like colanders 13) Like Jarlsberg 14) Like Jarlsberg cheese 15) Like old socks 1) Leaky 2) Porous 
[adj] - allowing passage in and out
porous adjective allowing passage in and out; `our unfenced and largely unpoliced border inevitably has been very porous`