safest

adj. secure; guarded, protected; careful, cautious; unharmed; involving low risk or harm or loss

Noun
1. strongbox where valuables can be kept safe
(hypernym) strongbox, deedbox
2. a ventilated or refrigerated cupboard for securing provisions from pests
(hypernym) cupboard, closet
(hyponym) meat safe
3. contraceptive device consisting of a thin rubber or latex sheath worn over the penis during intercourse
(synonym) condom, rubber, safety, prophylactic
(hypernym) contraceptive, preventive, preventative, contraceptive device, prophylactic device, birth control device
Adjective
1. free from danger or the risk of harm; "a safe trip"; "you will be safe here"; "a safe place"; "a safe bet"
(antonym) dangerous, unsafe
(similar) fail-safe
(see-also) harmless
2. of an undertaking
(similar) unadventurous
3. having reached a base without being put out; "the runner was called safe when the baseman dropped the ball"
(synonym) safe(p)
(antonym) out(p), retired
(classification) baseball, baseball game, ball
4. financially sound; "a good investment"; "a secure investment"
(synonym) dependable, good, secure
(similar) sound
5. in safekeeping; "your secret is safe with me"
(similar) secure

A safe program analysis is one which will not reach invalid conclusions about the behaviour of the program. This may involve making safe approximations to properties of parts of the program. A safe approximation is one which gives less information.
For example, strictness analysis aims to answer the question "will this function evaluate its argument"?. The two possible results are "definitely" and "don't know". A safe approximation for "definitely" is "don't know". The two possible results correspond to the two sets: "the set of all functions which evaluate their argument" and "all functions". A set can be safely approximated by another which contains it.

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