Section 1.3.3, sub I, has discussed idiomatic PPs like in zʼn knollentuin 'very happy' (lit.: in his vegetable garden) in copular constructions such as (93a). Such PPs do not express locational meaning, but generally refer to a mental state of the entity they are predicated of. In this respect, they behave like the adjective tevreden 'satisfied' in (93b) and this similarity goes beyond this superficial semantic correlation; such PPs also behave syntactically more like adjectives than like “regular” PPs. For example, like tevreden in (93b), the idiomatic PPs in (93a) may take a PP-complement, which is certainly not a common feature of regular PPs.

The idiomatic PPs in (93a) also behave more or less like adjectives with respect to modification; see example (372) in Section 1.3.3, sub I, for a larger sample of modification possibilities. Example (94a), for instance, shows that amplification by means of zeer/erg 'very' gives rise to a perfect result. They differ from adjectives, however, in that downtoners like vrij in (94b) are not possible, which is perhaps due to the fact that these idiomatic PPs inherently express a relatively high degree.

The examples in (95) show that the idiomatic PPs in (93a) also behave like adjectives in that they allow (periphrastic) comparative/superlative formation. Not all degrees of comparison give rise to an equally felicitous result, however; the majorative and maximative degree in (95a) are clearly better than the equative in (95b), and the minorative and minimative degree in (95c). Possibly this is due to the same reason why downtoners give rise to a marked result: insofar as the minorative degree is acceptable it feels like an understatement meaning “Jan is not happy with this book”.

      Observe that the modifiers modify the complete PP, which is clear from the fact, illustrated in (96a), that the PP-complement can (at least marginally) occupy the position between the modifier and the idiomatic PP. It is even more clearly shown by the fact that stranded prepositions of PP-complements may intervene between the modifier and the idiomatic PP, as is shown in (96b). In this respect these idiomatic PPs resemble the pseudo-participles discussed in Section A2.3.1, sub III.

The prepositions met'with' and zonder'without' function as antonyms. The first can be characterized as existential in the sense that it implies the existence of its complement, whereas the latter can be characterized as its “negative” counterpart in the sense that it denies the existence of its complement. This means that, in a sense, met and zonder differ in the same way as the indefinite articles een'a' and ∅ and their negative counterpart geen'no'. Given that the preposition met is existential, its nominal complement is compatible with a numeral: (97a) expresses that there are (two) exceptions. Being the negative counterpart of existential met, the preposition zonder is not compatible with a numeral on its nominal complement: (97b) can express that there are no exceptions, but not that two exceptions do not exist.

The examples in (98) show that the “negative” preposition zonder and the “negative” indefinite article geen are also similar in that they can both be modified by means of approximative modifiers like vrijwel'virtually' and absolute modifiers like helemaal'completely', which indicate whether or not the implied negation is absolute.