'Unreasonable' also means what it has been understood to mean in this context for at least half a century. The expression aptly describes conduct which is vexatious, designed to harass the other side rather than advance the resolution of the case, and it makes no difference that the conduct is the product of excessive zeal and not improper motive. But conduct cannot be described as unreasonable simply because it leads in the event to an unsuccessful result or because other more cautious legal representatives would have acted differently. The acid test is whether the conduct permits of a reasonable explanation. If so, the course adopted may be regarded as optimistic and as reflecting on a practitioner's judgment, but it is not unreasonable.
…
We were invited to give the three adjectives (improper, unreasonable and negligent) specific, self-contained meanings, so as to avoid overlap between the three. We do not read these very familiar expressions in that way. Conduct which is unreasonable may also be improper, and conduct which is negligent will very frequently be (if it is not by definition) unreasonable. We do not think any sharp differentiation between these expressions is useful or necessary or intended." [at 323D - 233E]
15 At 233-234, their Lordships pointed out that a legal practitioner did not act improperly, unreasonably or negligently simply because he or she acted for someone whose case was doomed to fail; their Lordships appeared to consider that something more, amounting in effect to abuse of process, was required:
"A legal representative is not to be held to have acted improperly, unreasonably or negligently simply because he acts for a party who pursues a claim or a defence which is plainly doomed to fail. … It is not entirely easy to distinguish by definition between the hopeless case and the case which amounts to an abuse of the process, but in practice it is not hard to say which is which and if there is doubt the legal representative is entitled to the benefit of it." [at 233F - 234F]
16 At 239, their Lordships noted that a finding that the legal practitioner had acted improperly, unreasonably or negligently did not mean that he or she must be ordered to pay wasted costs. Such a finding enlivened the discretion to make such an order, and required, in their Lordships' view, that their be some reason why the discretion should not be exercised in favour of the parties seeking it:
"Even if the court is satisfied that a legal representative has acted improperly, unreasonably or negligently and that such conduct has caused the other side to incur an identifiable sum of wasted costs, it is not bound to make an order, but in that situation it would of course have to give sustainable reasons for exercising its discretion against making an order." [at 239F]
17 The "two additional riders" to which Sully J referred in Ideal Waterproofing were:
(1) the jurisdiction to order costs against a legal practitioner personally is one to be exercised sparingly, because (among other things), the court would not always know all the details and circumstances of the practitioner's instructions. Thus, for the jurisdiction to arise, the conduct must involve some serious dereliction of duty or gross negligence ( Dal Pont: Lawyers' Professional Responsibility in Australia and New Zealand (Second Edition) at 374-375); and
(2) the inherent power of the court to order its officers to pay costs in an appropriate case is ordinarily one to be exercised on the basis of a serious dereliction of the duty owed by the officer to the court. However, it is neither necessary nor desirable to define the level of incompetence or negligence at which the costs jurisdiction will arise ( Harley v McDonald [1999] 3 NZLR 545 at [59] to [61]).
18 I am not entirely sure that the views expressed in Harley are directly applicable to the exercise of the power conferred by s99 of the Civil Procedure Act . Harley was a case on the inherent jurisdiction of the court. That is why their Honours talked about conduct amounting to a serious dereliction of the duty owed by a legal practitioner to the court. For better or for worse, the legislature has seen fit to enact a statutory test that is framed in the terms now to be found in s99, and not by reference to the test of serious dereliction favoured by the Court of Appeal in Harley .
19 With that qualification, however, I propose to do as Windeyer J did in Karwal v Skrzypczak [2007] NSWSC 931 at [9], and proceed substantially on the basis outlined by Sully J in Ideal Waterproofing . I note in passing that Windeyer J at [10] appeared to share my doubt as to the relevance of cases involving the inherent jurisdiction to the exercise of the power conferred by s99.
20 I see little point in analysing further the numerous decisions to which I was referred. I intend no disrespect thereby either to the submissions or to the decisions in question.