specific

having a special application, bearing, or reference; specifying, explicit, or definite.

to state one's specific purpose.

specified, precise, or particular.

a specific sum of money.

Antonyms:

vague

peculiar or proper to somebody or something, as qualities, characteristics, effects, etc..

His specific problems got him into trouble.

of a special or particular kind.

concerned specifically with the item or subject named (used in combination).

The Secretary addressed himself to crop-specific problems.

Biology. of or relating to a species.

specific characters.

Medicine/Medical.

1. (of a disease) produced by a special cause or infection.

2. (of a remedy) having special effect in the prevention or cure of a certain disease.

Immunology. (of an antibody or antigen) having a particular effect on only one antibody or antigen or affecting it in only one way.

Commerce. noting customs or duties levied in fixed amounts per unit, as number, weight, or volume.

Physics.

1. designating a physical constant that, for a particular substance, is expressed as the ratio of the quantity in the substance to the quantity in an equal volume of a standard substance, as water or air.

2. designating a physical constant that expresses a property or effect as a quantity per unit length, area, volume, or mass.

explicit, particular, or definite

please be more specific

relating to a specified or particular thing

a specific treatment for arthritis

of or relating to a biological species

specific differences

(of a disease) caused by a particular pathogenic agent

physics

1. characteristic of a property of a particular substance, esp in relation to the same property of a standard reference substance

   specific gravity

2. characteristic of a property of a particular substance per unit mass, length, area, volume, etc

   specific heat

3. (of an extensive physical quantity) divided by mass

   specific heat capacity

   specific volume

Also (rare): specifical.  commerce denoting a tariff levied at a fixed sum per unit of weight, quantity, volume, etc, irrespective of value