solidus

armarium – chest, cupboard, safe
impunitus – safe, unpunished, unrestrained
incolumis – safe, scatheless, unharmed, uninjured
integer – chaste, complete, entire, irreproachable, undamaged, unhurt, untouched, whole
salvus – safe, sound, unhurt
securus – free from care, safe, secure, unconcerned, unworried
summa – sum, the highest part, whole
totus – all, complete, entire, whole
tutis – protected, safe, secure
tutus – expedient, safe, salutary, serviceable, wholesome

solitas – being alone, lonliness, solitude
solito – have the habit of, make a practice of, to be accustomed to
solitudo – desert, isolation, loneliness, solitude
solitus – accustomed, customary, habitual, ordinary, usual
solium – bath, chair of state, throne
socer – father in law
societas – fellowship
socius – allied, ally, associate, associated, companion, comrade, fellow, partner, sharing
socors – slothful
socus – plowshare

so·li·dus[1]