BE LOST IN THOUGHT

Albanian

jam i zhytur në mendime. (various references)

Bulgarian 

замислям се (become thoughtful, meditate, think). (various references)

Czech

ponořený do myšlenek (immersed in thought). (various references)

Finnish

olla mietteissään. (various references)

German

in Gedanken vesunken sein (to be lost in thought). (various references)

Hungarian

gondolataiban elveszve. (various references)

Indonesian

termenung (muse). (various references)

Japanese Kanji 

思案に暮れる (to be lost in thought). (various references)

Japanese Katakana 

しあんにくれる (to be lost in thought). (various references)

Pig Latin

ebay ostlay inay oughtthay.(various references)

Russian 

задумываться (brood over, muse about, muse upon). (various references)

Serbo-Croatian

biti izgubljen u mislima. (various references)

Spanish

ensimismarse (abstract, get conceited, lose oneself). (various references)

Swedish

försjunken i sina tankar. (various references)

Turkish

derin derin düşünmek (chew, chew the cud, think deeply), dalmak (barge, bathe, be absorbed in, be wraped up in, bounce, break, break into, conk, contemplate, cut into, dip, dive, drop, drowse off, duck, engross, groove, jut into, lose oneself in, meditate, muse, nip in, pitch into, plummet, plunge, pore, pore over, rush in, rush into, sail in, sink, sink into). (various references)