These words characterize that which does not change, pass away or fade. Permanent is a broad word and means continuing in the same place or condition without change for a indefinitely long period of time: the permanent foundation of a building; the permanent effect of Latin on the English language; permanent damage to the spinal cord. Lasting is closely synonymous with permanent , but is used to refer to something that may end sooner or later: a lasting friendship; the lasting effects of having been in combat. Enduring is a stronger word than either permanent or lasting , since it implies great resistance to both time and change: the enduring grandeur of Bach chorales; the enduring pyramids of Egypt. Perpetual is perhaps the strongest word in the entire group, and emphasizes the sense of continuing endlessly in time. It refers chiefly to an activity that is not susceptible to interruption: the perpetual flow of the river: a perpetual rain; her perpetual complaints. Durable , less closely related to the above words, describes that which is able to continue for a long time in the same state and has the power to resist change, decay and wear: durable woollen cloth; the durable granite of the cliff; the durable and indomitable spirit of the old gold prospector.

Perennial differs from the other words in that it originally stipulated a set period of time – the year. In one sense it has come to mean lasting for one year or recurring every year: perennial plants. Now, by extension, it means both permanent and perpetual in describing something that is unceasing and also impervious to change: the perennial rise and fall of the tides; the perennial ties between parents and children.

Stable applies to that which has a firmness of character or position so as to resist change or displacement: a stable currency; a stable economy. Alone in this group, stable is applied to human personality as marked by steadfastness of purpose, emotional balance and the ability to cope with stress: a nervous, excitable teacher not considered stable enough to continue with her work.

Indelible means permanent in the sense of not being easily erased or obliterated: indelible strawberry stains on a tablecloth; an old letter written in indelible ink; a scene of horror that left an indelible impression on his memory.

Abiding refers to that which ahs continued and will continue for a long time. It is applied mostly to feelings and abstract concepts abiding love; abiding truth. It is now found mostly in poetry and literature of the past, and is best replaced by lasting or enduring .