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252.
 Adjectives expressing passive qualities,
but occasionally active, are formed by means of the suffixes  -  
| -ilis, -bilis, -ius,
-tilis (-silis) | frag-ilis, frail; | 
| nó-bilis, well known, famous; | nóscere (GNO), to
know. | 
| exim-ius,
choice, rare (cf.  é-greg-ius); | eximere, to take out, select. | 
| ag-ilis, active; | agere, to drive. | 
| hab-ilis, handy; | habére, to hold. | 
| al-tilis, fattened
(see note); | alere, to
nourish. | 
NOTE:  Of these, -ius is
primary, but is also used as secondary (cf.  § 241.  b.  N.).
-ilis is both primary (as in agilis, fragilis) and secondary (as in similis, like, cf.  oo , oo , English same); -bilis is in some way related to -bulum and -brum (§ 240.  N.); in -tilis and -silis,
-lis is added to to-
(so-), stem of the perfect participle:
 as, fossilis, dug up (from fossus, dug); volátilis, winged (from volátus, flight). 
 
 
 
